MTC Air Conditioner USER MANUAL
MTC-1
MANUAL AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
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PRECAUTIONS .......................................................... 5
Precautions for Supplemental Rest raint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 5
Precautions for Working with HFC-134a (R-134a) ..... 5
Contaminated Refrigerant ........................................ 5
General Refrigerant Precautions .............................. 6
Precautions for Leak Detection Dye ......................... 6
A/C Identification Label ............................................ 7
Precautions for Refrigerant Connection ................... 7
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION ................................ ...................... 7
O-RING AND REFRIGERANT CONNECTION ..... 8
Precautions for Servicing Compressor ....................11
Precautions for Service Equipment .........................11
RECOVERY/RECYCLING EQUIPMENT .............11
ELECTRONIC LEAK DETECTOR .......................11
VACUUM PUMP ................................................. 12
MANIFOLD GAUGE SET .................................... 12
SERVICE HOSES ............................................... 12
SERVICE COUPLERS ........................................ 13
REFRIGERANT WEIGHT SCALE ...................... 13
CHARGING CYLINDER ...................................... 13
Wiring Diagrams and Trouble Diagnosis ................ 13
PREPARATION ......................................................... 14
Special Service Tools ............................................. 14
HFC-134a (R-134a) Service Tools and Equipment ... 14
Commercial Service Tools ...................................... 16
REFRIGERATION SYSTEM ....................... ....... ....... 18
Refrigerant Cycle ................................................... 18
REFRIGERANT FLOW ....................................... 18
Refrigerant System Protection ............................... 18
REFRIGERANT PRESSURE SENSOR ............. 18
PRESSURE RELIEF VALVE .............................. 19
Component Layout ................................................. 20
FRONT REFRIGERATION SYSTEM .................. 20
REAR REFRIGERATION SYSTEM .................... 21
LUBRICANT ................................ ................... ........... 22
Maintenance of Lubricant Quantity in Compressor ...22
LUBRICANT ........................................................ 22
CHECKING AND ADJUSTING ............................ 22
AIR CONDITIONER CONTROL ...............................24
Description ................... ...... ....... ...... ........................ 24
Operation .............. ................................. ................. 24
AIR MIX DOOR CONTROL ................................. 24
BLOWER SPEED CONTROL ............................. 24
INT AKE DOORS CONTROL ............................... 24
MODE DOOR CONTROL ................................... 24
DEFROSTER DOOR CONTROL ........................ 24
MAGNET CLUTCH CONTROL ........................... 25
SELF-DIAGNOSTIC SYSTEM ........... ...... ....... ....25
Description of Control System ................................26
Control Operation ................................................... 26
DISPLAY SCREEN ..............................................27
TEMPERATURE DIAL (TEMPERATURE CON-
TROL) (FRONT) ..................................................27
TEMPERATURE DIAL (TEMPERATURE CON-
TROL) (REAR) .................................................... 27
RECIRCULATION () SWITCH .............................27
REAR WINDOW DEFOGGER SWITCH ............. 27
OFF DIAL (BLOWER SPEED SET TO 0) ........... 27
A/C SWITCH ....................................................... 27
MODE DIAL ......................................................... 27
FRONT BLOWER CONTROL DIAL .................... 27
REAR BLOWER CONTROL DIAL ...................... 27
Discharge Air Flow .................................................28
FRONT ................................................................ 28
REAR ..................................................................28
System Description .................................................29
SWITCHES AND THEIR CONTROL FUNCTION ...29
CAN Communication System Description .............. 30
TROUBLE DIAGNOSIS ............................................ 31
CONSULT-II Function (BCM) ............................. ....31
CONSULT-II BASIC OPERATION .......................31
DATA MONITOR .................................................32
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ......................................................33
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WORK FLOW ......................................................33
SYMPTOM TABLE ..............................................33
Component Parts and Harness Connector Location ...35
ENGINE COMPARTMENT ........................... ....... 35
FRONT PASSENGER COMPARTMENT ............36
REAR PASSENGER COMPARTMENT ............... 37
Schematic ................. ..............................................38
Wiring Diagram —A/C,M— ..................................... 39
Front Air Control Terminals and Reference Value ... 48
PIN CONNECTOR TERMINAL LAYOUT ............48
TERMINALS AND REFERENCE VALUE FOR
FRONT AIR CONTROL ....................................... 48
A/C System Self-diagnosis Function ......................50
DESCRIPTION ....................................................50
Operational Check ..................................................52
CHECKING BLOWER .........................................52
CHECKING DISCHARGE AIR ............................52
CHECKING RECIRCULATION ............................52
CHECKING TEMPERATURE DECREASE .........53
CHECKING TEMPERATURE INCREASE ..........53
CHECK A/C SWITCH ..........................................53
Power Supply and Ground Circuit for Front Air Con-
trol ............................. .......................... .................... 54
INSPECTION FLOW ...........................................54
COMPONENT DESCRIPTION ............................55
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM ...55
Mode Door Motor Circuit ........................................57
INSPECTION FLOW ...........................................57
SYSTEM DESCRIPTION .................................... 58
COMPONENT DESCRIPTION ............................58
DIAGNOSTIC PROCEDURE FOR MODE
DOOR MOTOR ...................................................58
Air Mix Door Motor Circuit ......................................61
INSPECTION FLOW ...........................................61
SYSTEM DESCRIPTION .................................... 62
COMPONENT DESCRIPTION ............................62
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (FRONT) ....................................62
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (REAR) ......................................64
Intake Door Motor Circuit ........................................ 67
INSPECTION FLOW ...........................................67
SYSTEM DESCRIPTION .................................... 68
COMPONENT DESCRIPTION ............................68
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR (DRIVER) ...................................68
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR (PASSENGER) ..........................69
Defroster Door Motor Circuit ............................ .......70
SYMPTOM: ...................................... ...... ....... .......70
INSPECTION FLOW ...........................................70
SYSTEM DESCRIPTION .................................... 71
COMPONENT DESCRIPTION ............................71
DIAGNOSTIC PROCEDURE FOR
DEFROSTER DOOR MOTOR ............................71
Front Blower Motor Circuit ...................................... 72
INSPECTION FLOW ...........................................72
SYSTEM DESCRIPTION .................................... 73
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR .................................. ............. ............. ....74
COMPONENT INSPECTION ...............................78
Rear Blower Motor Circuit .......................................80
INSPECTION FLOW ....... ....... ...... ....... ...... ...........80
SYSTEM DESCRIPTION .....................................81
DIAGNOSTIC PROCEDURE FOR REAR
BLOWER MOTOR ...............................................81
COMPONENT INSPECTION ...............................89
Rear Air Control Circuit ...........................................91
INSPECTION FLOW ....... ....... ...... ....... ...... ...........91
SYSTEM DESCRIPTION .....................................92
DIAGNOSTIC PROCEDURE FOR REAR AIR
CONTROL ...........................................................92
Magnet Clutch Circuit ..............................................94
INSPECTION FLOW ....... ....... ...... ....... ...... ...........94
SYSTEM DESCRIPTION .....................................95
DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH ..............................................................95
COMPONENT INSPECTION ...............................99
Insufficient Cooling ................................................100
INSPECTION FLOW ....... ....... ...... ....... ...... .........100
PERFORMANCE TEST DIAGNOSES ..............101
PERFORMANCE CHART ..................................104
TROUBLE DIAGNOSES FOR UNUSUAL PRES-
SURE .............................. ...................................105
Insufficient Heating ...............................................108
INSPECTION FLOW ....... ....... ...... ....... ...... .........108
Noise ............................ .........................................109
INSPECTION FLOW ....... ....... ...... ....... ...... .........109
Self-diagnosis .......................................................110
INSPECTION FLOW ....... ....... ...... ....... ...... .........110
Ambient Sensor Circuit ......................................... 111
COMPONENT DESCRIPTION .......................... 111
AMBIENT TEMPERATURE INPUT PROCESS .111
DIAGNOSTIC PROCEDURE FOR AMBIENT
SENSOR ......................... ................................... 111
COMPONENT INSPECTION .............................113
Intake Sensor Circuit .............................................113
COMPONENT DESCRIPTION ..........................113
DIAGNOSTIC PROCEDURE FOR INTAKE SEN-
SOR ...................................................................113
COMPONENT INSPECTION .............................115
CONTROL UNIT .......................... ...... ....... ...... ....... ..116
Removal and Installation .......................................116
FRONT AIR CONTROL .....................................116
REAR AIR CONTROL .......................................116
AMBIENT SENSOR ................................................117
Removal and Installation .......................................117
INTAKE SENSOR .............................. ....... ...... ....... ..118
Removal and Installation .......................................118
REMOVAL ........................................................ ..118
INSTALLATION ......... .........................................118
BLOWER MOTOR ...................................................119
Removal and Installation .......................................119
FRONT BLOWER MOTOR ................................119
REAR BLOWER MOTOR ..................................120
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IN-CABIN MICROFILTER ....................................... 121
Removal and Installation ...................................... 121
FUNCTION ...................................... ............. ..... 121
REPLACEMENT TIMING .................................. 121
REPLACEMENT PROCEDURES ..................... 121
HEATER & COOLING UNIT ASSEMBLY .............. 122
Components ................................ ......................... 122
Removal and Installation ...................................... 123
FRONT HEA TER AND COOLING UNIT ASSEM-
BLY .................................................................... 123
REAR HEATER AND COOLING UNIT ASSEM-
BLY .................................................................... 124
HEATER CORE ....................... ...... ....... ...... ....... ..... 125
Components ................................ ......................... 125
Removal and Installation ...................................... 126
FRONT HEATER CORE ................................... 126
REAR HEATER CORE ..................................... 127
HEATER PUMP ....................... ...... ....... ...... ....... ..... 128
Removal and Installation ...................................... 128
REMOVAL ......................................................... 128
INSTALLATION ................................................. 128
DEFROSTER DOOR MOTOR ................................ 129
Removal and Installation ...................................... 129
REMOVAL ......................................................... 129
INSTALLATION ................................................. 129
INTAKE DOOR MOTOR ......................................... 130
Components ................................ ......................... 130
Removal and Installation ...................................... 131
DRIVER SIDE ................................................... 131
PASSENGER SIDE ........................................... 132
MODE DOOR MOTOR ........................................... 133
Removal and Installation ...................................... 133
REMOVAL ......................................................... 133
INSTALLATION ................................................. 134
AIR MIX DOOR MOTOR ......................................... 135
Components ................................ ......................... 135
Removal and Installation ...................................... 135
AIR MIX DOOR MOTOR (FRONT) ................... 135
AIR MIX DOOR MOTOR (REAR) ..................... 136
FRONT BLOWER MOTOR RESISTOR ................. 137
Removal and Installation ...................................... 137
REMOVAL ......................................................... 137
INSTALLATION ................................................. 137
REAR BLOWER MOTOR RESISTOR ................... 138
Removal and Installation ...................................... 138
REMOVAL ......................................................... 138
INSTALLATION ................................................. 138
DUCTS AND GRILLES .......................................... 139
Components .........................................................139
Removal and Installation ......................................142
DEFROSTER NOZZLE .....................................142
FRESH AIR DUCT ............................................142
DEFROSTER DUCT .........................................142
RH AND LH SIDE DEMISTER DUCT ...............142
RH, LH, AND CENTER VENTILATOR DUCT ...142
FLOOR CONNECTOR DUCT ...........................142
FLOOR DISTRIBUTION DUCT .........................142
FLOOR DUCT ...................................................142
REAR OVERHEAD DUCT ................................142
REAR FLOOR DUCT ............................... ....... ..142
GRILLES ...........................................................143
REFRIGERANT LINES ...........................................144
HFC-134a (R-134a) Service Procedure ...............144
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................144
Components .........................................................146
Removal and Installation for Compressor ............148
REMOVAL .........................................................148
INSTALLATION .................................................148
Removal and Installation for Compressor Clutch .149
REMOVAL .........................................................149
INSPECTION ....................................................150
INSTALLATION .................................................150
BREAK-IN OPERATION ....................................152
Removal and Installation for Low-pressure Flexible
Hose .....................................................................152
REMOVAL .........................................................152
INSTALLATION .................................................152
Removal and Installation for High-pressure Flexible
Hose .....................................................................152
REMOVAL .........................................................152
INSTALLATION .................................................152
Removal and Installation for High-pressure Pipe .153
REMOVAL .........................................................153
INSTALLATION .................................................153
Removal and Installation for High/Low-pressure
Pipe ......................................................................153
REMOVAL .........................................................153
INSTALLATION .................................................153
Removal and Installation for Refrigerant Pressure
Sensor ..................................................................153
REMOVAL .........................................................153
INSTALLATION .................................................153
Removal and Installation for Condenser ..............154
REMOVAL .........................................................154
INSTALLATION .................................................154
Removal and Installation for Front Evaporator .....155
REMOVAL .........................................................155
INSTALLATION .................................................156
Removal and Installation for Rear Evaporator ......157
REMOVAL .........................................................157
INSTALLATION .................................................158
Removal and Installation for Front Expansion Valve .158
REMOVAL .........................................................158
INSTALLATION .................................................158
Removal and Installation for Rear Expansion Valve .158
REMOVAL .........................................................158
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INSTALLATION ......................... ............. ............158
Checking for Refrigerant Leaks ............................159
Checking System for Leaks Using the Fluorescent
Dye Leak Detector .......... ....... ...... ....... ...... ............159
Dye Injection ....... ...... ...... ......................................159
Electronic Refrigerant Leak Detector ....................160
PRECAUTIONS FOR HANDLING LEAK
DETECTOR .............................. .........................160
CHECKING PROCEDURE ................................161
SERVICE DATA AND SPECIFICATIONS (SDS) ....163
Service Data and Specifications (SDS) ................163
COMPRESSOR .............. ...................................163
LUBRICANT .................... ............. ............. .........163
REFRIGERANT .................................................163
ENGINE IDLING SPEED ...................................163
BELT TENSION .................................. ...... ....... ..163
PRECAUTIONS
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PRECAUTIONS PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EJS001RK
The Supplemental Rest raint System such as “AIR BAG” and “SEAT BELT PR E-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Manual.
WARNING:
● To avoid rendering the SRS inopera tive, whi ch could incr ease the risk of pe rsonal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer.
● Improper maintenance, inc luding incorrect removal and installation of the SRS, can lead to per-
sonal injury ca use d by unintentional ac tiv atio n o f the system. For remo va l of Spiral Cable and Air
Bag Module, see the SRS section.
● Do not use electrical test equ ipment o n any circu it related to the SRS unless in structed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Working with HFC-134a (R-134a) EJS001RL
WARNING:
● CFC-12 (R-12) refrigerant and HFC-13 4a (R-1 34a) refrige rant are not com patible. If the refrigera nts
are mixed compressor failure is likely to occur. Refer MTC-5, "
Contaminated Refrigerant" . To
determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant
Recovery/R ecycling Recharging equipment and Refrigerant Identifier.
● Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) compo-
nents. If lubricant other than that specified is used, compressor failure is likely to occur.
● The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-
lowing handling precautions must be observed:
– When removing refrig erant components from a vehicl e, immediately cap (s eal) the component to
minimize the entry of moisture from the atmosphere.
– When installing refrigera nt components to a vehicle, do not r emove the caps (unseal) until just
before connecting the com ponen ts. Connect all refrigeran t loop compo nents as quickly as poss ible to minimize the entry of moisture into system.
– Only use the specified lubricant from a sealed container. Immediately reseal containers of lubri-
cant. Without proper sealing, lubricant will become moisture saturated and should not be used.
– Avoid breathing A/C refrigerant and lubrica nt vapo r or mist. Ex posure may irritate eyes, nose a nd
throat. Remo ve HF C -13 4a ( R- 13 4a ) f ro m t he A /C sy ste m u si n g ce r ti fie d se r vice e qu i pm ent m ee tin g
requirements of SAE J2210 [HFC-134a (R-134a) recycling equipment] or J2209 [HFC-134a (R-134a)
recycling equipment]. If accidental system discharge occurs, ventilate work area before resuming
service. Additional health an d safety information may be obtained from refrigerant a nd lubricant
manufacturers.
– Do not allow refrigerant lubricant to come in contact with styrofoam parts. Damage may result.
Contaminated Refrigerant EJS001RM
If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:
● Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant
into the atm osphere.
● Explain that recov ery of the con taminated refrig erant cou ld dama ge your serv ice equi pment and re friger-
ant supply.
● Suggest the cust omer return the v ehic le t o t he lo cation of prev ious servic e w here the c ontami natio n may
have occurred.
● If you choose t o per form the re p air, recover the re frige ran t usin g onl y dedicated equipment and contain-
ers. Do not recover contaminated refrigerant into your existing service equipment. If your facility
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does not have de dicat ed re cover y equi pmen t, you ma y cont ac t a loc al ref rig erant produ ct ret ai ler f or avai lable service. This refrigerant must be disposed of in accordance with all federal and local regulations. In
addition, replacement of all refriger ant system components on the vehicle is recommended.
● If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact Nissan Cus-
tomer Affairs for further assistance.
General Refrigerant Precautions EJS001RN
WARNING:
● Do not release refrigerant into the air. Use approved recover y/recycling equipment to capture the
refrigerant every time an air conditioning system is discharged.
● Always wear eye and hand protectio n (goggles and glov es) when workin g with any refrigerant o r
air conditioning system.
● Do not store or heat refrigerant containers above 52°C (125°F).
● Do not heat a refrigerant container with an ope n fl am e; if container warming is require d, p lac e the
bottom of the container in a warm pail of water.
● Do not intentionally drop, puncture, or incinerate refrigerant containers.
● Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.
● Refrigerant will displace o xygen, therefore be certain to work in well ventilated areas to prevent
suffocation.
● Do not pressure test or lea k test HFC-134a (R-134a) se rvice equipment and/or veh icle air condi-
tioning systems with co mpressed air during repair. Some mixtures of air and HFC-13 4a (R-134a)
have been shown to be c ombustible a t eleva ted press ures. The se mixtures , if igni ted, may cause
injury or p rop ert y da mage . Add iti onal hea lt h and s afe ty i nfor mat ion m ay be obtained from refri gerant manufacturers.
Precautions for Leak Detection Dye EJS001RO
● The A/C syste m cont a ins a f luor escen t leak d ete ctio n dye u sed for loc ating r efri ger ant le aks. An ul travi ole t
(UV) lamp is required to illuminate the dye when inspecting for leaks.
● Always wear fluoresce nc e en hancing UV safety gl as s es to p rotect your eyes a nd en ha nc e the visibility of
the fluorescent dye.
● The fluore sc en t dye lea k d et e ctor i s no t a r e pl ac ement f o r an el e ctr on ic ref r ige r an t le ak de te cto r. The fluo-
rescent dye leak detector should be used in conjunction with an electronic refrigerant leak detector (J-
41995).
● For your safety and th e custom er's satis faction, read and follo w all manuf acturer's operating i nstruction s
and precautions prior to perform in g work.
● A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal
should only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995).
● Always remove any dye from the leak area after repairs are complete to avoid a misdiagnosis during a
future service.
● Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled,
clean immedi ate ly wit h th e app roved dye c lean er. Fluorescent dye left on a s urfac e for an exte nded pe rio d
of time cannot be removed .
● Do not spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.).
● Do not use more than one refrigerant dye bottle (1/4 ounce / 7.4 cc) per A/C system.
● Leak detection dyes for H FC-134a (R134a) and CFC-12 (R-1 2) A/C systems are different. Do not use
HFC-134a (R134a) leak detection dye in CFC-12 (R-12) A/C systems or CFC-12 (R-12) leak detection
dye in HFC-134a (R134a) A/C systems or A/C system damage may result.
● The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure
occurs.
PRECAUTIONS
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A/C Identification Label EJS001RP
Vehicles with factory installed fluorescent dye have thi s id entification
label on the underside of ho od .
Precautions for Refrigerant Connection EJS001RQ
A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.
● Expansion valve to co oling unit
● Evaporator pipes to evapora tor (inside cooling unit)
● Refrigerant pressure sensor
FEATURES OF NEW TYPE REFRIGERANT CONNECTION
● The O-ring has been relocated. It has also been provided with a groove for proper installation. This
reduces the po ssibil ity o f th e O-ring b eing caug ht in , or da maged by, the mating par t. Th e seal ing direct ion
of the O-ring is now se t vert ic al ly in re la tio n to th e co nt a ct in g su rf ace of th e mat ing p a rt t o im pro ve seal i ng
characteristics.
● The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facil-
itating piping connections.
WJIA1232E
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O-RING AND REFRIGERANT CONNECTION
WJIA0370E
PRECAUTIONS
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CAUTION:
The new and former refrigeran t connections use different O-ring configuratio ns. Do not confuse Orings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at or
around the connection.
1. High-pressure service valve 2. Low-pressure service valve 3. High-pressure pipe
4. Refrigerant pressure sensor 5. Low-pressure flexible hose 6. High-pressure flexible hose
7. Shaft seal 8. Condenser 9. Liquid tank
10. Pressure relief valve 11. Compressor 12. Evaporator
13. High/low pressure pipe
LJIA0016E
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O-Ring Part Numbers and Specifications
*: Always check with the Parts Department for the latest parts information.
WARNING:
Make sure all refrigera nt is disc ha rg ed into the rec yc ling equi pm ent a nd the pr es su re in the sy ste m is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.
CAUTION:
When replacing or cleanin g refrigerant cycle components, observe the following.
● When the compressor is remo ved, store it in the sa me positio n as it is whe n mounted on the car.
Failure to do so will cause lubricant to enter the low pressure chamber.
● When connecting tubes, always use a torque wrench and a back-up wrench.
● After disconnecting tubes, immediately plug all openings to prevent entr y of dirt and mo isture.
● When installing an air conditioner in the vehicle, c onne ct the pipes as the final stage of the opera-
tion. Do not remove the seal ca ps of pipes and other components until just before required for
connection.
● Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.
● Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
● Always replace used O-rings.
● When connecting tube, apply lubricant to circle of the O-rings shown in illustration. Be careful not
to apply lubricant to threaded portion.
● O-ring must be closely attached to dented portion of tube.
● When replacing the O-ring, be careful not to damage O-ring and tube.
● Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that
the O-ring is installed to tube correctly.
Connection type
O-ring
size
Part number* D mm (in) W mm (in)
New 8 92471 N8210 6.8 (0.268) 1.85 (0.0728)
Former 10 J2476 89956 9.25 (0.3642) 1.78 (0.0701)
New
12
92472 N8210 10.9 (0.429) 2.43 (0.0957)
Former 92475 71L00 11.0 (0.433) 2.4 (0.094)
New
16
92473 N8210 13.6 (0.535) 2.43 (0.0957)
Former 92475 72L00 14.3 (0.563) 2.3 (0.091)
New
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92474 N8210 16.5 (0.650) 2.43 (0.0957)
Former 92477 N8200 17.12 (0.6740) 1.78 (0.0701)
New 24 92195 AH300 21.8 (0.858) 2.4 (0.094)
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PRECAUTIONS
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● After connecting li ne, co nduct leak test and ma ke s ure that there is no lea kage from c onnections.
When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten connections of seal seat to the specified torque.
Precautions for Servicing Compressor EJS001RR
● Plug all openings to prevent moisture and foreign matter from entering.
● When the compressor is removed, store it in the same position as it is when mounted on the car.
● When replacing or repairing com pressor, follow “Maintenance of Lubrica nt Quantity in Com pres-
sor” exactly. Refer to MTC-22, "
Maintenance of Lubricant Quantity in Compressor" .
● Keep friction surfac es between clutch an d pulley clean. If the s urface is contaminated with lu bri-
cant, wipe it off by using a clean waste cloth moistened with thinner.
● After compressor service operation, turn the compressor shaft by hand more than 5 turns in both
directions. This will e qually distribute lubricant inside the compresso r. After the compresso r is
installed, let the engine idle and operate the compressor for 1 hour.
● After replac ing the compre ssor magnet clutch, apply voltage to the new one and check for normal
operation. Refer to MTC-149, "
Removal and Installation for Compressor Clutch"
Precautions for Service Equipment EJS001RS
RECOVERY/ RECYCLING EQUIPMENT
Follow the man uf ac turer's instructio ns for machine op era tion and machi ne m ai nte na nc e . N e ve r i ntroduce any
refrigerant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR
Follow the manufacturer's instructions for tester operation and tester maintenance.
RHA861F
MTC-12
PRECAUTIONS
Revision: January 2005 2004 Quest
VACUUM PUMP
The lubricant contained inside the vac uum pump is not co mpatible
with the specified lubricant for HFC-134a (R-134a) A/C systems.
The vent side of the vacuum pump is exposed to atmospheric pressure so the vacuu m pump l ubric ant ma y migra te ou t of th e pump in to
the service hose. This is possible when the pump is switched off
after evacuation (vacuuming) and hose is connected to it.
To prevent this migration, use a manual valve situated near the
hose-to-pump connection, as follows.
● Usually vacuum pumps have a manual isolator valve as part of
the pump. Close this valve to isolate the service hose from the
pump.
● For pumps without an isolator, use a hose equipped with a man-
ual shut-off valve near th e pump end. Clo se the valv e to isolate
the hose from the pump.
● If the hose has an automatic shut off valve, disconnect the hose
from the pump: as long as the hose is connected, the valve is
open and lubricating oil may migrate.
Some one-way valves open when vacuum is applied and close
under a no vacuum co ndition. Such valves ma y restrict the pump's
ability to pull a deep vacuum and are not recom mended.
MANIFOLD GAUGE SET
Be certain that the gauge face indicates HFC-134a (R-134a) Make
sure the gauge set h as 1/2″-16 ACME threaded connections for service hoses. Confirm the set has been used only with refrigerant
HFC-134a (R-134a) along with specified lubricant.
SERVICE HOSES
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shutoff devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge .
RHA270D
SHA533D
RHA272D
PRECAUTIONS
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SERVICE COUPLERS
Never attempt to conn ect HFC-134a (R-1 34a) service coupl ers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. If an improper
connection is attempted, discharging and contamination may occur.
REFRIGERANT WEIGHT SCALE
Verify that no refrigerant other than HFC134a (R-134a) and specified
lubricants have been used with the scale. If the scale controls refrigerant flow electronically, the hose fitting must be 1/2”-16 ACME.
CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may be vented into air from cylinder's top valve
when filling the cylinder with refrigerant. Also, the accuracy of the cylinder is generally less than that of an
electronic sc ale or of quality recycle/recharge equipment.
Wiring Diagrams and Trouble Diagnosis EJS001RT
When you read wiring diagrams, refer to the following:
● GI-12, "How to Read Wiring Diagrams".
● PG-4, "POWER SUPPLY ROUTING CIRCUIT".
When you perform trouble diagnosis, refer to the following:
● GI-9, "How to Follow Trouble Diagnoses".
● GI-25, "How to Perform Efficient Diagnosis for an Electrical Incident".
Shut-off valve rotation A/C service valve
Clockwise Open
Counterclockwise Close
RHA273D
RHA274D
MTC-14
PREPARATION
Revision: January 2005 2004 Quest
PREPARATION PFP:00002
Special Service Tools EJS001RU
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
HFC-134a (R-134a) Service Tools and Equipment EJS001RV
Never mix HFC-134a refrigerant and/or its specified lubricant with CFC-12 (R-12) refrigerant and/or its lubricant.
Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/lubricant.
Refrigerant containe r fittings, service hose fitti ngs and service equipment fit tings (equipment which handle s
refrigerant and/or lubricant) are differ ent between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid
mixed use of the refrigerants/lubricant.
Adapters that convert one size fitting to another must never be used refrigerant/lubricant contamination will
occur and compress or fai lure will result.
Tool number
(Kent-Moore No.)
Tool name
Description
KV99234330
(J-38873A)
Pulley installer
Installing pulley
KV99233130
(J-29884)
Pulley puller
Removing pulley
LHA171
LHA172
Tool number
(Kent-Moore No.)
Tool name
Description
HFC-134a (R-134a)
(—)
Refrigerant
Container color: Light blue
Container marking: HFC-134a (R134a)
Fitting size: Thread size
● large container 1/2"-16 ACME
KLH00-PAGS0
(—)
NISSAN A/C System Oil Type DHPS
Type: Poly alkylene glycol oil (PAG),
type DH-PS
Application: HFC-134a (R-134a) vane
rotary compresso rs (NISSAN only)
Lubricity: 40 m (1.4 US fl oz, 1.4 Imp
fl oz)
—
(ACR2005-NI)
ACR5 A/C Service Center
Refrigerant recovery and recycling and
recharging
S-NT196
S-NT197
WJIA0293E
PREPARATION
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—
(J-41995)
Electronic refrigerant leak detector
Checking for refrigerant leaks
(Power supply: DC 12V (Cigarette
lighter)
—
(J-43926)
Refrigerant dye leak detection kit
Kit includes:
(J-42220)
UV lamp and UV safety goggles
(J-41459)
Refrigerant dye injector
(J-41447)
Quantity 24, 1/4 ounce bottles of
HFC-134a (R-134a) fluorescent
leak detection dye
(J-43872)
Refrigerant dye cleaner
Leak detection dye
(Power supply: DC 12V battery terminal)
—
(J-42220)
Fluorescent dye leak detector
Checking for refrigerant leaks when fluorescent dye is installed in A/C system.
Includes: UV lamp and UV safety goggles
(Power supply: DC 12V battery terminal)
—
(J-41447)
HFC-134a (R-134a) fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles)
Application: For HFC-134a (R-134a)
PAG oil
Container: 1/4 ounce (7.4cc) bottle
(Includes self-adhesive dye identification labels for affixing to vehicle after
charging system with dye.)
—
(J-41459)
HFC-134a (R-134a) Dye injector
Use with (J-41447) 1/4 ounce bottles
For injecting 1/4 ounce of fluorescent
leak detection dye into A/C system.
—
(J-43872)
Refrigerant dye cleaner
For cleaning dye spills.
Tool number
(Kent-Moore No.)
Tool name
Description
AHA281A
ZHA200H
SHA438F
SHA439F
SHA440F
SHA441F
MTC-16
PREPARATION
Revision: January 2005 2004 Quest
Commercial Service Tools EJS001RW
—
(J-39183-C)
Manifold gauge set (with hoses
and couplers)
Identification:
● The gauge face indicates R-134a.
Fitting size: Thread size
● 1/2"-16 ACME
Service hoses:
● (J-39500-72B)
High side hose
● (J-39500-72R)
Low side hose
● (J-39500-72Y)
Utility hose
Hose colors:
● Low side hose: Blue with black stripe
● High side hose: Red with black stripe
● Utility hose: Yellow with black stripe
or green with black stripe
Hose fitting to gauge:
● 1/2"-16 ACME
Service couplers:
● (J-39500-20A)
High side coupler
● (J-39500-24A)
Low side coupler
Hose fitting to service hose:
● M14 x 1.5 fitting is optional or perma-
nently attached.
—
(J-39699)
Refrigerant weight scale
For measuring of refrigerant
Fitting size - thread size:
● 1/2" - 16 ACME
—
(J-39649)
Vacuum pump
(Including the isolator valve)
Capacity:
● Air displacement: 4 CFM
● Micron rating: 20 microns
● Oil capacity: 482 g (17 oz)
Fitting size: Thread size
● 1/2"-16 ACME
Tool number
(Kent-Moore No.)
Tool name
Description
RJIA0196E
S-NT201
S-NT202
S-NT200
S-NT203
PREPARATION
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Tool number
Tool name
Description
(J-41810-NI)
Refrigerant identifier equipment (R134a)
For checking refrigerant purity and
system contamination
Power tool Loosening bolts and nuts
(J-44614)
Clutch disc holding tool
Clutch disc holding tool
RJIA0197E
PBIC0190E
WHA230
MTC-18
REFRIGERATION SYSTEM
Revision: January 2005 2004 Quest
REFRIGERATION SYSTEM PFP:KA990
Refrigerant Cycle EJS001RX
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the front and resar evaporators, and back to the compressor. The refrigerant evaporation through the
evaporator coils are controlled by a fr ont and rear externally e qualized expansion v alves, located inside t he
front and rear evaporator cases.
Refrigerant System Protect ion EJS001RY
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sensor , l oc at ed on t he co nd enser. If the syste m p ress ur e r is es ab ov e or fa lls be lo w t he sp eci fic at i on s, t he ref r ige rant pressure sensor detects the pressure inside the refrigerant line and sends a voltage signal to the ECM.
The ECM deenergizes the A/C relay to disengage the magnetic compressor clutch when pressure on the high
pressure side detected by refri gerant pressure sensor is over about 2,746 kPa (28 kg /cm
2
, 398 psi), or below
about 120 kPa ( 1 .22 kg/cm
2
, 17.4 psi).
REFRIGERATION SYSTEM
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PRESSURE RELIEF VALVE
The refrige rant system i s also protected by a pr essure relief valve, loc ated in the rear head of the compressor.
When the pressure of refrigerant in the system increases to an abnormal level [more than 2,990 kPa (30.5 kg/
cm
2
, 433.6 psi)], the release p ort on the pressure relief valv e automatically open s and releases refrigerant
into the atmosphere.
WJIA1342E
MTC-20
REFRIGERATION SYSTEM
Revision: January 2005 2004 Quest
Component Layout EJS001RZ
FRONT REFRIGERATION SYSTEM
LJIA0085E
REFRIGERATION SYSTEM
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REAR REFRIGERATION SYSTEM
1. Defroster nozzle 2. Fresh air duct 3. Defroster duct
4. RH side demister duct 5. LH side demister duct 6. RH ventilator duct
7. Center ventilator duct 8. LH ventilator duct 9. Front heater and cooling unit assembly
10. Floor connector duct 11. Floor distribution duct 12. Floor duct
1. Rear overhead duct 2. Rear heat duct 3. Rear heater and cooling unit assembly
4. Clips
LJIA0086E
MTC-22
LUBRICANT
Revision: January 2005 2004 Quest
LUBRICANT PFP:KLG00
Maintenance of Lubricant Quantity in Compressor EJS001S0
The lubricant in the c ompressor circulates thro ugh the syst em with the refrig erant. Add lubr icant to compre ssor when repl ac in g an y c omp on en t or a f te r a la rge r e fri ge ran t le ak ag e h as occu r red . It is im po rtant to maintain
the specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:
● Lack of lubricant: May le ad to a seized compressor
● Excessive lubricant: Inadequate cooling (thermal exchange interference)
LUBRICANT
Name: Nissan A/C System Lubricant Type (DH-PS)
Part number: KLH00-PAGS0
CHECKING AND ADJUSTING
CAUTION:
If excessive lubricant leakage is noted, do not perform the lubricant return operation.
Start the engine and set the following conditions:
test condition
● Engine speed: Idling to 1,200 rpm
● A/C switch: On
● Blower speed: Max. position
● Temp. con trol: Op tiona l [Set so that intake air temperat ure is 25° to 30° C (77° to 86°F).]
● Intake position: Recirculation ( )
● Perform lubricant return operation for about ten minutes
Adjust the lubricant quantity according to the following table.
Lubricant Adjusting Procedure for Components Replacement Except Compressor
After replacing any of the following major components, add the correct amount of lubricant to the system.
Amount of Lubricant to be Added
*1: If refrigerant leak is small, no addition of lubricant is needed.
Lubricant Adjustment Procedure for Compressor Replacement
1. Before connecting recovery/recycling equipment to vehicle, check recovery/recycling equipment gauges.
No refrigerant pressure should be displayed. If NG, recover refrigerant from equipment lines.
2. Connect recovery/recycling equipment to vehicle. C onfirm refrigerant purity in supply tank using recovery/
recycling equipment and refrigerant identifier. If NG, refer to MTC - 5, "
Contaminated Refrigerant" .
3. Confirm refrigerant purity in vehicle A/C system using recovery/recycling equipment and refrigerant identifier. If NG, refer to MTC-5, "
Contaminated Refrigerant" .
4. Discharge refr ig era nt in to th e rec ov ery /re cy c lin g eq ui pm en t. Me as ure lub ric an t dis c ha rged into the recovery/recycling equip m en t.
5. Drain the lubricant from the “old” (removed) compressor into a graduated container and recover the
amount of lubricant drained.
6. Drain the lubricant from the “new” compressor into a separate, clean container.
Part replaced
Lubricant to be added to system
Remarks
Amount of lubricant
m (US fl oz, Imp fl oz)
Front evaporator 75 (2.5, 2.6) —
Rear evaporator 75 (2.5, 2.6) —
Condenser 75 (2.5, 2.6) —
Liquid tank 5 (0.2, 0.2) Add if compressor is not replaced.
In case of refrigerant leak
30 (1.0, 1.1) Large leak
— Small leak *1
LUBRICANT
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7. Measure an amount of new lubricant installed equal to amount drained from “old” compressor. Add this
lubricant to “new” comp re ss or thro ug h the suct io n po rt ope ni ng .
8. Measure an amount o f n ew l ub ric an t eq ua l to t h e a mou nt r e cover e d d uri ng di sc har gi ng. A d d thi s l u bri can t
to “new” compressor through the suction port opening.
9. If the liquid tank also needs to be replaced, add an additional 5 m (0.2 US fl oz, 0.2 Imp fl oz) of lubricant
at this time.
Do not add this 5 m (0.2 US fl oz, 0.2 Imp fl oz) of lubricant if only replacing the compressor.
RHA065DD
MTC-24
AIR CONDITIONER CONTROL
Revision: January 2005 2004 Quest
AIR CONDITIONER CONTROL PFP:27500
Description EJS001UD
The front air control provides regulation of the vehicle's interior temperature. The system is based on the position of the front air controls temperature switch selected by the driver. This is done by utilizing a microcomputer, also referred to as the front air control, which receives input signals from the following three sensors:
● Ambient sensor
● Intake sensor
● PBR (Position Balanced Resistor).
The front air control uses th ese signals (including the set position of the temperature switch) to control:
● Outlet air volume
● Air temperature
● Air distribution
The front air control also provides separate regulation of the vehicle's interior temperature for the rear passenger area. The system is based on the temperature and rear blower settings selected from rear control
switches located on the front air control, or from the temperature and rear blower settings selected from rear
control switches on the rear air control, when the front air co ntrol switches are set to the rear position.
The front air control is used to select:
● Outlet air volume
● Air temperature/distribution
Operation EJS001S2
AIR MIX DOOR CONTROL
The air mix door is controlled so that in-vehicle temperature changed based on the position of the temperature
switch.
BLOWER SPEED CONTROL
Blower speed is controlled based on front and rear blower switch settings.
When blower swit ch is turned, the blower m otor starts and increases air flow v olume each time the blowe r
switch is turned clockwise, and de creases air flow volume each time th e blower switch is turned counterclockwise.
When engine coola nt tempe rature is low, the blower motor oper ation is de layed to prevent coo l air from f lowing.
INTAKE DOORS CONTROL
The intake doors are controlled by the recirculation switch setting, and the mode (defroster) switch setting.
MODE DOOR CONTROL
The mode door is controlled by the position of the mode switch.
DEFROSTER DOOR CONTROL
The defroster door is controlled by: Turning the defroster dial to front defroster.
AIR CONDITIONER CONTROL
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MAGNET CLUTCH CONTROL
When the A/C switch is pressed, or the mode switch is turned to the defroster position, the front air control outputs a compressor ON signal to BCM.
The BCM then sends a compressor ON signal to ECM, via CAN communication line.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sensor signal, throttle an gle sensor, etc.). If it judges compres s or ca n b e turn ed ON , it sends compresso r ON si gnal to IPDM E/R, via CAN communication line.
Upon receipt of comp ressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate compressor.
SELF-DIAGNOSTIC SYSTEM
The self-diagnosti c system is buil t into the front air control to qu ickly locate the cause of symptom s. Refer to
MTC-50, "
A/C System Self-diagnosis Function" .
WJIA1203E
MTC-26
AIR CONDITIONER CONTROL
Revision: January 2005 2004 Quest
Description of Control Syste m EJS001S3
The control sy stem consists of input sensors, switches, the front air co ntrol (microcomputer) and outputs.
The relation ship of these components i s shown in the figure below:
Control Operation EJS001S4
Front air control
WJIA1610E
WJIA0485E
AIR CONDITIONER CONTROL
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Rear air control
DISPLAY SCREEN
Displays the operational status of the system.
TEMPERATURE DIAL (TEMPERATURE CONTROL) (FRONT)
Increases or decreases the set temperature.
TEMPERATURE DIAL (TEMPERATURE CONTROL) (REAR)
Increases or decreases the set temperature.
RECIRCULATION () SWITCH
● When REC switch is ON, REC switch indicator turns ON, and air inlet is set to REC.
● When REC switch is turned OFF, or when compressor is turned from ON to OFF, REC switch is automati-
cally turned OFF. REC mode can be re-entered by pressing REC switch again.
● REC switch is not operated when DEF switch is turned ON, or at the D/F position.
REAR WINDOW DEFOGGER SWITCH
When switch is ON, rear window is defogged.
OFF DIAL (BLOWER SPEED SET TO 0)
The compressor a nd blower are OFF, the intake doors are set to the outside air position, and t he air outlet
doors are set to the foot (75% foot and 25% defrost) position.
A/C SWITCH
The compressor is ON or OFF.
MODE DIAL
Controls the air discharge outlets thr ough control of the mode and defroster doors.
FRONT BLOWER CONTROL DIAL
Manually control the blower speed. Four speeds are available for manual control (as shown on the display
screen).
REAR BLOWER CONTROL DIAL
When the rear blower switch (front) is in the OFF position, the rear blower motor cannot operate.
When the rear blow er switch (front) is in the RE AR position, it al lows the rear b lower switch (re ar) to control
the rear blower motor speed. In any other position (1-4) , the rear blower switch (front) controls the rear blower
motor speed regardless of the rear blower swi tch (rear) posi tio n.
LJIA0024E
MTC-28
AIR CONDITIONER CONTROL
Revision: January 2005 2004 Quest
Discharge Air Flow EJS001S6
FRONT
REAR
WJIA1037E
LJIA0127E
AIR CONDITIONER CONTROL
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System Description EJS001S7
SWITCHES AND THEIR CONTROL FUNCTION
WJIA0531E
WJIA0532E
MTC-30
AIR CONDITIONER CONTROL
Revision: January 2005 2004 Quest
CAN Communication System Description EJS001S8
Refer to LAN-6, "CAN COMMUNICATION" .
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