Nissan Sentra 2004 Owner's Manual
J AIR CONDITIONER
A
B
SECTION
MANUAL AIR CONDITIONER
CONTENTS
PRECAUTIONS .......................................................... 3
Precautions for Supplemental Rest raint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions for Working with HFC-134a (R-134a) ..... 3
Contaminated Refrigerant ........................................ 3
General Refrigerant Precautions .............................. 4
Precautions for Leak Detection Dye ......................... 4
A/C Identification Label ............................................ 4
Precautions for Refrigerant Connection ................... 5
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION ................................ ...................... 5
O-RING AND REFRIGERANT CONNECTION ..... 6
Precautions for Servicing Compressor ..................... 8
Precautions for Service Equipment .......................... 8
RECOVERY/RECYCLING EQUIPMENT .............. 8
ELECTRONIC LEAK DETECTOR ........................ 8
VACUUM PUMP ................................................... 9
MANIFOLD GAUGE SET ...................................... 9
SERVICE HOSES ................................................. 9
SERVICE COUPLERS ........................................ 10
CHARGING CYLINDER ...................................... 10
Wiring Diagrams and Trouble Diagnosis ................ 10
PREPARATION ..........................................................11
Special Service Tools ..............................................11
HFC-134a (R-134a) Service Tools and Equipment ... 12
COMMERCIAL SERVICE TOOL ........................ 14
REFRIGERATION SYSTEM ....................... ....... ....... 15
Refrigeration Cycle ................................................. 15
REFRIGERANT FLOW ....................................... 15
FREEZE PROTECTION ..................................... 15
REFRIGERANT SYSTEM PROTECTION .......... 15
LUBRICANT ............................................................. 16
Maintenance of Lubricant Quantity in Compressor ... 16
LUBRICANT ....................... ................................. 16
CHECKING AND ADJUSTING ........................... 16
TROUBLE DIAGNOSIS ............................................ 19
Component Layout ................................................. 19
Control Operation ........... ....... ...... ....... ...... .............. 20
FAN CONTROL SWITCH ................................... 20
REAR WINDOW DEFOGGER SWITCH ............. 20
MODE CONTROL KNOB ....................................20
TEMPERATURE CONTROL KNOB .................... 20
RECIRCULATION (REC) SWITCH ..................... 20
AIR CONDITIONER (A/C) SWITCH ....................20
Discharge Air Flow .................................................21
System Description .................................................22
SWITCHES AND THEIR CONTROL FUNC-
TIONS .................................................................22
Component Location ..............................................23
ENGINE COMPARTMENT .................................. 23
PASSENGER COMPARTMENT .........................24
Wiring Diagram — Heater — .................................. 25
QG18DE MODELS .............................................. 25
Wiring Diagram — A/C, M — ..................................27
QG18DE MODELS .............................................. 27
QR25DE MODELS ..............................................31
How to Perform Trouble Diagnoses for Quick and
Accurate Repair ......................................................34
WORK FLOW ......................................................34
SYMPTOM TABLE .............................................. 34
Operational Check ..................................................35
CONDITIONS: ....................... ..............................35
PROCEDURE: .................................................... 35
Main Power Supply and Ground Circuit Check ...... 37
POWER SUPPLY CIRCUIT CHECK ................... 37
INTAKE DOOR .......................................................... 38
Trouble Diagnosis Procedure for Intake Door ........ 38
Component Description .......................................... 38
INT AKE DOOR MOTOR ......................................38
Intake Door Motor Circuit ........................................39
Control Linkage Adjustment ...................................41
INT AKE DOOR MOTOR ......................................41
Mode Door ...... ....................................... ...... ....... ....42
TROUBLE DIAGNOSIS PROCEDURE FOR
MODE DOOR ......................................................42
CONTROL LINKAGE ADJUSTMENT .................43
Air Mix Door ............................................................44
TROUBLE DIAGNOSIS PROCEDURE FOR AIR
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MIX DOOR ..........................................................44
Temperature Control Linkage Adjustment .............. 45
BLOWER MOTOR ....................................................46
Trouble Diagnosis Procedure for Blower Motor ......46
Blower Motor Circuit ...............................................46
Electrical Components Inspection ..........................50
FAN CONTROL SWITCH ....................................50
BLOWER MOTOR ...............................................50
FAN RESISTOR .................................................. 50
MAGNET CLUTCH ...................................................51
Trouble Diagnosis Procedure for Magnet Clutch ....51
Magnet Clutch Circuit .............................................52
Electrical Component Inspection ............................55
A/C RELAY ..........................................................55
REFRIGERANT PRESSURE SENSOR ..............56
INSUFFICIENT COOLING ........................................57
Trouble Diagnosis Procedure for Insufficient Cool-
ing ............................. .............................................. 57
Performance Te st Diagnoses .................................58
Performance Chart .................................................60
TEST CONDITION ..............................................60
TEST READING ..................................................60
Trouble Diagnoses for Abnormal Pressure .............61
BOTH HIGH AND LOW-PRESSURE SIDES ARE
TOO HIGH. ..........................................................61
HIGH-PRESSURE SIDE IS TOO HIGH AND
LOW-PRESSURE SIDE IS TOO LOW. ...............61
HIGH-PRESSURE SIDE IS TOO LOW AND
LOW-PRESSURE SIDE IS TOO HIGH. ..............62
BOTH HIGH- AND LOW-PRESSURE SIDES
ARE TOO LOW. .... ...... ....... ...... ....... ...... ....... .......62
LOW-PRESSURE SIDE SOMETIMES
BECOMES NEGATIVE. .......................................63
LOW-PRESSURE SIDE BECOMES NEGATIVE.
...63
INSUFFICIENT HEATING .........................................64
Trouble Diagnosis Procedure for Insufficient Heat-
ing ............................. .............................................. 64
NOISE .......................... ...... ....... ...... ....... ...... ....... .......65
Trouble Diagnosis Procedure for Noise ..................65
INTAKE SENSOR .....................................................66
Intake Sensor Circuit ..............................................66
COMPONENT DESCRIPTION ............................66
DIAGNOSTIC PROCEDURE ..............................66
Removal and Installation ........................................67
COMPRESSOR ........................ ................................. 68
Removal and Installation ........................................68
COMPRESSOR CLUTCH .........................................69
Overhaul .................................................................69
QG18DE ..............................................................69
QR25DE ..............................................................69
Removal .................................................................70
QG18DE ..............................................................70
QR25DE ..............................................................71
Inspection ..................... ............. ............. ............. ....72
CLUTCH DISC .....................................................72
PULLEY ...............................................................72
COIL ................................ ....... ..............................72
Installation .......................... .....................................72
QG18DE ..............................................................72
QR25DE .......................... ....... ...... ....... ...... ...........74
Break-In Operation ..................................................75
THERMAL PROTECTOR ..........................................76
Inspection ..................... ............. ............. ............. ....76
IN-CABIN MICROFILTER ..........................................77
Removal and Installation .........................................77
FUNCTION ..........................................................77
REPLACEMENT TIMING ....................................77
REPLACEMENT PROCEDURES ........................77
HEATER & COOLING UNIT (HEATER CORE) ........78
Removal ............................. .....................................78
Installation .......................... .....................................78
BLOWER UNIT ..........................................................79
Removal ............................. .....................................79
Installation .......................... .....................................79
A/C EV APORATOR ...................................................80
Removal ............................. .....................................80
Installation .......................... .....................................81
REFRIGERANT LINES .............................................82
HFC-134a (R-134a) Service Procedure ..................82
SETTING OF SERVICE TOOLS AND EQUIP-
MENT .............................. .....................................82
Removal and Installation .........................................84
QG18DE ..............................................................84
QR25DE .......................... ....... ...... ....... ...... ...........85
Checking Refrigerant Leaks ....................................86
PRELIMINARY CHECK ............................ ....... ....86
Electronic Refrigerant Leak Detector ......................86
PRECAUTIONS FOR HANDL ING LEAK
DETECTOR .........................................................86
CHECKING PROCEDURE ..................................87
Fluorescent Dye Leak Detector ..............................88
PRECAUTIONS FOR FLUORESCENT DYE
LEAK DETECTION ..............................................88
CHECKING SYSTEM FOR LEAKS USING THE
FLUORESCENT LEAK DETECTOR ...................88
DYE INJECTION ..................................................88
BELT ............................... ...........................................90
Tension Adjustment ......................... ....... ...... ....... ....90
SERVICE DATA AND SPECIFICATIONS (SDS) ......91
General Specifications ............................................91
COMPRESSOR .............. .....................................91
LUBRICANT .................... ............. ............. ...........91
REFRIGERANT ...................................................91
Inspection and Adjustment ......................................91
ENGINE IDLING SPEED (WHEN A/C IS ON) .....91
BELT TENSION .................................. ...... ....... ....91
MTC-2
PRECAUTIONS
PRECAUTIONS PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER”
EJS001QX
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The Supplemental Re straint System such as “AIR BAG” and “SEAT BELT PRE-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 col lision. Information necessary to service the system safely is includ ed in the SRS a nd 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 sec tion.
● 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)
EJS001A7
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 and com pressor fai lure is l ikely to occu r. Refer to MTC-3, "
Contaminated Refrigerant" .
To determine the purity of HFC-134a (R-134a) in t he vehicle and recovery tank, use Ref rigerant
Recovery/R ecycling Recharging equipment and Refri gerant 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. Remove R-134a from the A/C system, using certifie d service equipment meeting requirements of SAE J2210 (R-134a recycling equipment), or J2209 (R-134a recovery equipment). If accidental system discharge occurs, ventilate work area before resuming service. Additional health
and safety information may be obtained from refrigerant and lubricant manufacturers.
– Do not allow A/C lubricant to come in contact with styrofoam parts. Damage may result.
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Contaminated Refrigerant
EJS001A8
If a refrigerant other than pure 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, re cover the r efri ger ant using on ly dedicated equipment and contain-
ers. Do not recover contaminated refrigerant into your existing service equipment. If your facility
does not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available service. This refrigerant must be disposed of in accordance with all federal and local regulations. In
addition, replacement of all refrigerant system components on the vehicle is recommended.
MTC-3
PRECAUTIONS
● 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
EJS001A9
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 compressed air during repair. Some mixtures of air and R-134a have been
shown to be combustibl e at elevated pressures. These m ixtures, if ignited, may cause injury or
property damage. Additiona l he al th a nd s afety information may be obtained from refrigera nt m an ufacturers.
Precautions for Leak Detection Dye
● 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
EJS001AA
(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.
● 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 electroni c 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. Flu oresce nt d ye le ft on a sur fac e for an ex tend ed pe riod
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 R-134a an d R-12 A/C sys tems are different. Do not use R-13 4a leak detecti on
dye in R-12 A/C sys tems or R- 12 le ak d etect ion d ye i n R-1 34a A/C sy stem s or A/ C sy stem dam age may
result.
● The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure
occurs.
A/C Identification Label
Ve hicl es ar e eq ui pp ed fac to r y ins talled fluo res cen t dy e and ha ve th is
identification label on the under side of hood.
NOTE:
Vehicles equipped with factory installed fl uoresc ent d ye ha ve a
green label.
MTC-4
EJS001AB
LHA175
PRECAUTIONS
Precautions for Refrigerant Connection
EJS001AC
FEATURES OF NEW TYPE REFRIGERANT CONNECTION
● The O-ring has been relocated. It has also been provided with a groove for proper installation. This elimi-
nates the chance of the O-ring being caught in, or damaged by, the mating part. The sealing direction of
the O-ring is now set vertically in re lation to the contacti ng surface of the m ating part to improv e sealing
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.
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PRECAUTIONS
O-RING AND REFRIGERANT CONNECTION
QG18DE
QR25DE
WJIA0417E
WJIA0418E
CAUTION:
The new and former refri gerant conn ections in some syste ms use differe nt O-ring c onfigurations . Do
not confuse O-rings since the y are not interchangeable. If a wro ng O-ring is installed, refrigerant will
leak at, or around, the connection.
MTC-6
PRECAUTIONS
O-Ring Part Numbers and Specifications
Connection type
New 8 92471 N8210 6.8 (0.268) 1.85 (0.0728)
Former 12 92475 71L00 10.8 (0.425) 1.78 (0.0701)
New 12 92472 N8210 10.9 (0.429) 3.65 (0.1437)
SHA814E
Former 16 92475 72L00 13.9 (0.547) 1.78 (0.0701)
New 16 92473 N8210 13.6 (0.535) 2.43 (0.0957)
O-ring
size
Part number* D mm (in) W mm (in)
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New 19 92474 N8210 16.5 (0.650) 2.43 (0.0957)
*: Always check with the Parts Department for the latest parts information.
WARNING:
Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.
● When the compress or is removed , store it in the same p osition as it is when m ounted on the car.
Failure to do so will cause lubricant to enter the low pr essure chamber.
● When connecting tubes, always use a torque wrench and a back-up wrench.
● After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
● When installing an air conditione r in the ve hi cle , co nne ct the pipe s as the final stage of the opera-
tion. Do not remove the seal c aps of pipes and other compone nts 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 use d 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.
Lubricant name: Genuine Nissan A/C System Lubricant Type R or equivalent
Part number: KLH00-PAGR0
● 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.
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PRECAUTIONS
● After connecting line, c onduct leak test and ma ke s ur e tha t th er e is no le ak age fr o m con nec tio n s.
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.
RHA861F
Precautions for Servicing Compressor
● 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 compressor, follow “Maintena nce of Lubricant Quantity in Co mpres-
sor” exactly. Refer to MTC-16, "
● Keep friction surfaces between clutch and pulley clean. If the surface is contaminated, with lubri-
Maintenance of Lubricant Quantity in Compressor" .
EJS001AD
cant, wipe it off by using a clean waste cloth moistened with thinner.
● After compressor service operation, turn the comp ressor shaft by hand more than five turns in
both directions. This w ill eq ually distribute lubrican t inside the compressor. After the compressor
is installed, let the engine idle and operate the compressor for one hour.
● After replacing the compressor magnet clutch, apply voltage to the new one and check for normal
operation. [Gap between clutch disc and pulley is 0.3 - 0.6 mm (0.012 - 0.024 in)]
Precautions for Service Equipment
EJS001AE
RECOVERY/RECYCLING EQUIPMENT
Follow the manufacturer's instructions for machine operation and machine maintenance. Never introduce any
refrigerant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR
Follow the manufacturer's instructions for tester operation and tester maintenance.
MTC-8
PRECAUTIONS
VACUUM PUMP
The lubricant contained inside the vacuum pump is not compatible
with the specified lubricant for HFC-134a (R-134a) A/C systems.
The vent side of the va cuum pump is ex posed to atmos pheric pres sure so the vacuum pump lubricant may migrate out of the pump into
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 vacuu m pumps have a manual isolator valve as part of
the pump. Close th is valve to isolate the servic e hose from the
pump.
● For pumps without an isol ator, use a hose equipped with a man-
ual shut-off valve near the pump end. Close the valve to isolate
the hose from the pump.
● If the hose h as a n automatic sh ut off valve, discon ne ct the hose
from the pump: a s long as the hose is connec ted, the valve is
open and lubric ating oil may migrate.
Some one-way valves open when vacuum is applied and close
under a no vacuum condition. Such valves may restrict the pump's
ability to pull a deep vacuum and are not recommend ed.
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MANIFOLD GAUGE SET
Be certain that the ga uge fa ce ind icat es R-13 4a or 13 4a. M ake s ure
the gauge set has 1/2 ″-16 ACME threaded connections for service
hoses. Confirm the set has been used only with refrigerant HFC134a (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 shut
off devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge.
RHA270D
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MTC-9
RHA272D
PRECAUTIONS
SERVICE COUPLERS
Never attempt to co nn ect HFC -13 4a (R-1 34 a) se r vic e coup l ers to an
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. However, if an
improper connection is attempted, discharging and contamination
may occur.
Shut-off valve rotation A/C service valve
Clockwise Open
Counterclockwise Close
RHA273D
CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may be vented into air from cylinder's top valve
when filling th e cylinder with refriger ant. Also, the accuracy of the cylinder is generall y less than that of an
electronic scale or of quality recycle/recharge equipment.
Wiring Diagrams and Trouble Diagnosis
When you read wiring diagrams, refer to the following:
● GI-13, "How to Read Wiring Diagrams"
● PG-5, "Wiring Diagram — POWER —"
When you perfo rm trouble diagnosis, refer to the following:
● GI-9, "How to Follow Trouble Diagnoses"
● GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident"
EJS001AF
MTC-10
PREPARATION
PREPARATION PFP:00002
Special Service Tools
Tool number
(Kent-Moore No.)
Tool name
KV99231260
(J-38874)
Clutch disc wrench
KV99232340
(J-38874)
Clutch disc puller
Description
Removing shaft nut and clutch disc
NT204
Removing clutch disc
EJS001AG
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(J-38873-A)
Drive plate installer
KV99234330
(J-39024)
Pulley installer
KV99233130
(J-39023)
Pulley puller
KV99233130
(J-29884)
(with small adaptor)
Pulley puller
S-NT376
WJIA0367E
NT207
NT208
Installing pulley and drive plate
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Installing pulley
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Removing pulley
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Removing pulley
LHA172
MTC-11
PREPARATION
HFC-134a (R-134a) Service Tools and Equipment
EJS001AH
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 different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid
mixed use of the refrigerants/lubricant.
Adapters that conv ert one size fitting to anot her must never be used: refrig erant/lubricant contamin ation will
occur and compress or fai lure will result.
Tool number
(Kent-Moore No.)
Tool name
HFC-134a (R-134a) refrigerant
S-NT196
KLH00-PAGR0
(–)
Genuine Nissan A/C System Lubricant Type R
S-NT197
(J-43600)
Recovery/Recycling
Recharging equipment (ACR2000)
Description
Container color: Light blue
Container marking: HFC-134a (R134a)
Fitting size:Thread size
● large container 1/2
Type: Poly alkylene glycol oil (PAG),
type R
Application: HFC-134a (R-134a) vane
rotary compressors (Nissan only)
Lubricity:40 ml [Litre] (1.4 US fl oz, 1.4
Imp fl oz)
Function: Refrigerant Recovery and
Recycling and Recharging
2
-16 ACME
(J-41995)
Electrical leak detector
(J-43926)
Refrigerant dye leak detection kit
Kit includes:
(J-42220) UV lamp and UV safety
glasses
(J-41459) Refrigerant dye injector
(J-41447) qty. 24
HFC-134a (R-134a) refrigerant
dye
(J-43872) Refrigerant dye cleaner
WJIA0293E
Power supply:
● DC 12V (Cigarette lighter)
AHA281A
Power supply:
DC 12V (Battery terminal)
SHA437F
MTC-12
PREPARATION
Tool number
(Kent-Moore No.)
Tool name
(J-42220)
Fluorescent dye leak detector
(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles)
(J-41459)
HFC-134a (R-134a) Dye injector
Use with J-41447, 1/4 ounce bottle
(J-43872)
Dye cleaner
SHA438F
SHA439F
SHA440F
Description
Power supply: DC 12V (Battery terminal)
For checking refrigerant leak when fluorescent dye is installed in A/C system.
Includes: UV lamp and UV safety
glasses
Application: For HFC-134a (R-134a)
PAG oil
Container: 1/4 ounce (7.4cc) bottle
(Includes self-adhesive dye identification labe ls for affixing to vehicle after
charging system with dye.)
For injecting 1/4 ounce of fluorescent
leak detection dye into A/C system.
For cleaning dye spills.
A
B
C
D
E
F
G
H
I
(J-39183)
Manifold gauge set (with hoses
and couplers)
Service hoses
● High side hose
(J-39501-72)
● Low side hose
(J-39502-72)
● Utility hose
(J-39476-72)
SHA441F
S-NT201
RJIA0196E
Identification:
● The gauge face indicates R-134a.
Fitting size:Thread size
2
● 1/2
-16 ACME
Hose color:
● Low hose: Blue with black stripe
● High hose: Red with black stripe
● Utility hose: Yellow with black stripe
or green with black stripe
Hose fitting to gauge:
2
● 1/2
-16 ACME
MTC
K
L
M
MTC-13
PREPARATION
Tool number
(Kent-Moore No.)
Tool name
Service couplers
● High side coupler
(J-39500-20)
● Low side coupler
(J-39500-24)
S-NT202
(J-39649)
Vacuum pump
(Including the isolator valve)
S-NT203
COMMERCIAL SERVICE TOOL
Tool name Description
(J-41810-NI)
Refrigerant identifier equipment
(R-134a)
Description
Hose fitting to service hose:
● M14 x 1.5 fitting is optional or perma-
nently attached.
Capacity:
● Air displacement: 4 CFM
● Micron rating: 20 microns
● Oil capacity: 482 g (17 oz)
Fitting size: Thread size
● 1/2
2
-16 ACME
(J-44614)
Clutch disc holding tool
For checking refrigerant purity and for
system contamination
RJIA0197E
For holding clutch disc
MTC-14
REFRIGERATION SYSTEM
REFRIGERATION SYSTEM PFP:KA990
Refrigeration Cycle
REFRIGERANT FLOW
The refrigerant fl ows in the standard pattern, that is, t hrough the co mpressor, the condenser, the liquid tank,
through the ev apora tor, and back to the co mpress or. The re frig era nt evapo rat ion th roug h the evapo rator coil is
controlled by an externally equalized expansion valve, located inside the evaporator case.
EJS001AI
A
B
FREEZE PROTECTION
The compress or cycl es go on and off to m aintain th e evap orator tempera ture wi thin a s pecifi ed range. When
the evaporator coil temperature falls below a specified point, the intake sensor interrupts the compressor operation. When the evaporator coil temperature rises above the specification, the thermo control amplifier allows
compressor operation.
REFRIGERANT SYSTEM PROTECTION
Refrigerant Pressure Sensor
The refrigerant sys tem is pro te cte d ag ai ns t ex ce ss iv ely high or low pressure s by the refr ig era nt pre s su re se nsor, located on the refrigera nt lines where they a ttach to the conden se r. If the system p r es su re ris e s ab ov e or
falls below th e specifications , the refriger ant pressure sen sor detects the p ressure inside the refrigerant line
and sends the voltage signal to the ECM. The ECM turns the A/C relay OFF and stops the compressor when
pressure on the high pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/
2
, 398 psi) or below about 177 kPa (1.8 kg/cm2 , 26 psi).
cm
Pressure Relief Valve
The refrige rant system i s also protec ted by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrig erant in the system inc reases to an abnorma l level [m ore than 3, 727 kPa (38 kg/
2
, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
cm
the atmosphere.
C
D
E
F
G
H
I
MTC
WJIA0419E
K
L
M
MTC-15
LUBRICANT
LUBRICANT
Maintenance of Lubricant Quantity in Compressor
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 ma intain
the specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:
● Lack of lubricant: May le ad to a seized com pressor
● Excessive lubricant: Inadequate cooling (thermal exchange interference)
PFP:KLG00
EJS001AJ
LUBRICANT
Name: Genuine Nissan A/C System Lubricant Type R or equivalent
Part number: KLH00-PA GR0
CHECKING AND ADJUSTING
Adjust the lubricant quantity according to the test group shown below.
1. LUBRICANT RETURN OPERATION
Can lubricant return op era tio n be perfo rmed?
● A/C system works properly.
● There is no evidence of a large amount of lubricant leakage.
Yes or No
Yes >> GO TO 2.
No >> GO TO 3.
2. PERFORM LUBRICANT RETURN OPERATION
1. Start engine, and set the following conditions:
– Test condition
Engine speed: Idling to 1,200 rpm
A/C switch: ON
Blower speed : Max. positio n
2. Perform lubricant return operation for about 10 minutes.
3. Stop engine.
CAUTION:
If excessive lubricant leakage is noted, do not perform the lubricant return operation.
>> GO TO 3.
3. CHECK COMPRESSOR
Should the compressor be replaced?
Yes or No
Yes >> GO TO MTC-68, "Removal and Ins tal lat ion" .
No >> GO TO 4.
4. CHECK ANY PART
Is there any part to be replaced? (Evaporator, condenser, liquid tank or in c ase there is evidence of a large
amount of lubricant leakage.)
Yes or No
Yes >> GO TO MTC-17, "Lubricant Adjustin g Pro cedu r e for Com po ne nts Repl ac em e nt Exc e pt Com pre s -
sor" .
No >> Carry out the A/C performance test.
MTC-16
LUBRICANT
Lubricant Adjusting Procedure for Components Replacement Except Compressor
After replacing any of the foll ow in g ma jo r com po ne nts, add the co rrec t am ount of lubricant to the system.
Amount of lubricant to be added
A
Lubricant to be added to
Part replaced
Evaporator 75 (2.5, 2.6) —
Condenser 75 (2.5, 2.6) —
Liquid tank 5 (0.2, 0.2)
In case of refrigerant leak
● *1: If refrigerant leak is small, no addition of lub ricant is needed.
system
Amount of lubricant
ml (US fl oz, Imp fl oz)
Add if compressor is not
30 (1.0, 1.1) Large leak
— Small leak *1
Remarks
replaced.
Lubricant Adjustment Procedure for Compressor Replacement
1. Before conn ecting the recovery/re cycling rechargi ng equipment to the v ehicle, check the recovery/recycling recharging equipment gauges. No refrigerant pressure should be displayed. If OK, recover refrigerant from equipment lines.
2. Confirm refrige rant purity in supply tank using recovery/recyclin g recharging equipment and refrigera nt
identifier. If NG, refer to MTC-3, "
3. Connect rec overy/r ec ycling rech argin g eq uipm ent t o the veh icle. Conf irm re frigera nt pu rity in v ehicle A/C
system using re covery/recycling recharging eq uipment and refrigerant identifier. If NG, refer to MTC-3,
"Contaminated Refrigerant" .
4. Discharge refrigerant into the refrigerant recovery/recycling recharging equipment. Measure lubricant discharged into the recovery/recycling recharging equipment.
5. Drain the lubricant from the “old” (removed) compressor into a graduated container and recover the
amount of lubricant dra ine d.
6. Drain the lubrica nt from the “new” compressor into a separate, clean container.
7. Measure an amount of new lubricant installed equal to amount drained from “old” compressor. Add this
lubricant to “new” compressor through the suction port opening.
8. Measure an am ount o f n ew l ub ric an t equa l t o t he a mou nt re cov er ed d ur i ng di sc ha rgi ng . Ad d t hi s l ubr i can t
to “new” compressor through the suct ion port opening.
9. If the liquid tank also needs to be replaced, add an additional 5 ml (0.2 US fl oz, 0.2 Imp fl oz) of lubricant
at this time.
Do not add this 5 ml (0.2 US fl oz, 0.2 Imp fl oz) of lubricant if only replacing the compressor.
Contaminated Refrigerant" .
B
C
D
E
F
G
H
I
MTC
K
L
MTC-17
M
LUBRICANT
RHA065DD
MTC-18
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS PFP:00004
Component Layout
EJS001AK
A
B
C
D
E
F
G
H
I
MTC
K
L
M
MTC-19
WJIA0257E
TROUBLE DIAGNOSIS
Control Operation
FAN CONTROL SWITCH
This switch turns the fan ON and OFF, and controls fan speed.
REAR WINDOW DEFOGGER SWITCH
This switch turns the rear window defogger ON and OFF.
EJS001AL
LHA109
MODE CONTROL KNOB
This control knob controls the outlet air flow.
When DEF or F/D mode is selected, the push control unit se ts the intake door to FR ESH.
The compressor turns on when DEF mode is selected and remains on until the key is turned off.
TEMPERATURE CONTROL KNOB
This knob adjusts the temperature of the discharge air.
RECIRCULATION (REC) SWITCH
OFF position: Outside air is drawn into the passenger compartment.
ON position: Interi or air is recirc ul ated inside the vehicle.
The indicator lamp will also light.
Recirculatio n is canc eled when D EF or F/D mode is selected, and resu mes w hen anot her mo de is ch osen.
AIR CONDITIONER (A/C) SWITCH
The air conditioner switch controls the A/C system. When the switch is depressed with the fan ON, the compressor will turn ON. The indicator lamp will also light.
The air conditioner cooling function operates only when the engine is running.
MTC-20
TROUBLE DIAGNOSIS
Discharge Air Flow
EJS001AM
A
B
C
D
E
F
G
H
I
MTC
K
L
M
MTC-21
LHA127
TROUBLE DIAGNOSIS
System Description
EJS001AN
SWITCHES AND THEIR CONTROL FUNCTIONS
Knob/Switch
A/C ——ON*1
Mode
*1: Compressor operation is controlled by the ECM (when the compressor is activated in DEF mode, it remains on until the key is turned
off).
*2: In DEF and F/D modes, REC switch is canceled .
A/C
Knob/Switch position
Air outlet Intake air Compressor
FACE ——
B/L ——
FOOT ——
F/D FRE —
DEF FRE ON*1
— REC*2 —
MTC-22
TROUBLE DIAGNOSIS
Component Location
ENGINE COMPARTMENT
EJS001AO
A
B
C
D
E
F
G
H
I
MTC
K
L
M
MTC-23
WJIA0248E
PASSENGER COMPARTMENT
TROUBLE DIAGNOSIS
MTC-24
WJIA0249E
TROUBLE DIAGNOSIS
Wiring Diagram — Heater —
QG18DE MODELS
EJS001AP
A
B
C
D
E
F
G
H
I
MTC
K
L
M
MTC-25
WJWA0052E
TROUBLE DIAGNOSIS
ECM TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL AND GROUND
TERMINAL WIRE COLOR ITEM CONDITION DATA (DC)
96 Y/G FAN CONTROL SWITCH
FAN CONTROL SWITCH "ON"
(ENGINE RUNNING)
FAN CONTROL SWITCH "OFF"
(ENGINE RUNNING)
APPROX. 0V
APPROX. 5V
MTC-26
TROUBLE DIAGNOSIS
Wiring Diagram — A/C, M —
QG18DE MODELS
EJS001AQ
A
B
C
D
E
F
G
H
I
MTC
K
L
M
MTC-27
WJWA0053E
TROUBLE DIAGNOSIS
ECM TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL AND GROUND
TERMINAL WIRE COLOR ITEM CONDITION DATA (DC)
96 Y/G FAN CONTROL SWITCH
110 L/R
AIR CONDITIONER SWITCH
SIGNAL
FAN CONTROL SWITCH "ON"
(ENGINE RUNNING)
FAN CONTROL SWITCH "OFF"
(ENGINE RUNNING)
BOTH A/C SWITCH AND
BLOWER SWITCH "ON" (ENGINE
RUNNING)
A/C SWITCH "OFF" (ENGINE
RUNNING)
APPROX. 0V
APPROX. 5V
APPROX. 0V
BATTERY VOLTAGE
MTC-28
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