Nissan Quest Heater Air Condition HA 2000 Owner's Manual

HEATER &

CONTENTS

AUTO

PRECAUTIONS ...............................................................3

Supplemental Restraint System (SRS) “AIR

BAG”............................................................................3

A/C Identification Label................................................3

Precautions for Working with HFC-134a (R-134a) .....4

Contaminated Refrigerant............................................4

Precautions for Leak Detection Dye............................4

General Refrigerant Precautions.................................5

Precautions for Refrigerant Connection......................5

Precautions for Servicing Compressor........................9

Precautions for Service Equipment.............................9

Wiring Diagrams and Trouble Diagnosis...................12

PREPARATION .............................................................13

HFC-134a (R-134a) Service Tools and

Equipment..................................................................13

Commercial Service Tools.........................................16

DESCRIPTION...............................................................18

Refrigeration System.................................................18

Component Layout ....................................................20

Introduction................................................................22

Features.....................................................................22

Overview of Control System......................................23

Control Operation ......................................................24

Discharge Air Flow.....................................................26

TROUBLE DIAGNOSES................................................27

Component Location..................................................27

Circuit Diagram — Auto Air Conditioner....................30

Wiring Diagram — A/C, A — .....................................31

How to Perform Trouble Diagnoses for Quick

and Accurate Repair..................................................35

Operational Check.....................................................36

Self-diagnosis ............................................................38

Malfunction Code/Symptom Chart.............................40

A/C System................................................................42

Air Mix Door...............................................................46

Intake Door................................................................54

Mode Door Motor.......................................................63

AIR CONDITIONER

SECTION

Front Blower Motor....................................................72

Memory Function.......................................................84

Rear Blower Motor.....................................................85

Magnet Clutch............................................................98

Insufficient Cooling ..................................................105

Insufficient Heating..................................................110

Noise........................................................................112

Ambient Temperature Sensor..................................113

In-vehicle Temperature Sensor................................116

Sunload Sensor.......................................................119

SERVICE PROCEDURE..............................................122

HFC-134a (R-134a) Service Procedure..................122

Maintenance of Lubricant Quantity in

Compressor .............................................................124

Compressor .............................................................127

Compressor Clutch..................................................128

Clutch Air Gap Adjustment ......................................130

Magnet Clutch..........................................................130

Shaft Seal................................................................131

Refrigerant Lines .....................................................134

Checking Refrigerant Leaks....................................135

Electronic Refrigerant Leak Detector ......................135

Fluorescent Dye Leak Detector...............................138

Belt...........................................................................140

Cabin Air Filter.........................................................140

Fast Idle Control Device (FICD)..............................142

Heater Core.............................................................142

Front Evaporator Core.............................................144

Rear Evaporator Core .............................................145

Spring Lock Coupling ..............................................145

SERVICE DATA AND SPECIFICATIONS (SDS).......148

Auto..........................................................................148

PRECAUTIONS ...........................................................149

Supplemental Restraint System (SRS) “AIR

BAG”........................................................................149

A/C Identification Label............................................149

MANUAL

IDX

CONTENTS (Cont’d)

Precautions for Working with HFC-134a (R-134a) .150

Contaminated Refrigerant........................................150

Precautions for Leak Detection Dye........................150

General Refrigerant Precautions.............................151

Precautions for Refrigerant Connection..................151

Precautions for Servicing Compressor....................155

Precautions for Service Equipment.........................156

Wiring Diagrams and Trouble Diagnosis.................158

PREPARATION ...........................................................159

HFC-134a (R-134a) Service Tools and

Equipment................................................................159

Commercial Service Tools.......................................162

DESCRIPTION.............................................................164

Refrigeration System...............................................164

Component Layout ..................................................166

Control Operation ....................................................168

Discharge Air Flow...................................................169

TROUBLE DIAGNOSES..............................................170

Component Location................................................170

Circuit Diagram — Manual Air Conditioner .............173

Wiring Diagram — A/C, M — ..................................174

How to Perform Trouble Diagnoses for Quick

and Accurate Repair................................................178

Operational Check...................................................179

Symptom Chart........................................................181

A/C System..............................................................183

Air Mix Door.............................................................185

Intake Door..............................................................189

Mode Door Motor.....................................................194

Front Blower Motor..................................................197

Rear Blower Motor...................................................206

Magnet Clutch..........................................................217

Insufficient Cooling ..................................................224

Insufficient Heating..................................................229

Noise........................................................................230

SERVICE PROCEDURE..............................................231

HFC-134a (R-134a) Service Procedure..................231

Maintenance of Lubricant Quantity in

Compressor .............................................................233

Compressor .............................................................236

Compressor Clutch..................................................237

Clutch Air Gap Adjustment ......................................239

Magnet Clutch..........................................................239

Shaft Seal................................................................240

Refrigerant Lines .....................................................243

Checking Refrigerant Leaks....................................245

Electronic Refrigerant Leak Detector ......................245

Fluorescent Dye Leak Detector...............................248

Belt...........................................................................250

Cabin Air Filter.........................................................250

Fast Idle Control Device (FICD)..............................252

Heater Core.............................................................252

Front Evaporator Core.............................................254

Rear Evaporator Core .............................................255

Spring Lock Coupling ..............................................255

SERVICE DATA AND SPECIFICATIONS (SDS).......258

Manual.....................................................................258

HA-2

PRECAUTIONS

Supplemental Restraint System (SRS) “AIR BAG”

AUTO

Supplemental Restraint System (SRS) “AIR BAG”

The Supplemental Restraint System “AIR BAG”, used alongwith a seat belt, helps to reduce therisk or severity of injury to the driver and front passenger in a frontal collision. The Supplemental Restraint System consists of air bag modules (located in the center of the steering wheel and on the instrument panel on the passenger side), a diagnosis sensor unit, warning lamp, wiring harness and spiral cable. Information necessary to service the system safely is included in the RS section of this Service Manual.

WARNING:

쐌 To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death

in the event of a collision which would result in air bag inflation, all maintenance should be performed by an authorized NISSAN dealer.

쐌 Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-

sonal injury caused by unintentional activation of the system.

쐌 Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses are covered with yellow insulation either just before the harness connectors or for the complete harness, for easy identification.

A/C Identification Label

Vehicles with factory installed fluorescent dye have this identification label on the underside of hood.

NOTE: Vehicles with factory installed fluorescent dye have a green label. Vehicles without factory installed fluorescent dye have a blue label.

NDHA0001

NDHA0155

IDX

HA-3

LHA218

PRECAUTIONS

Precautions for Working with HFC-134a (R-134a)

AUTO

Precautions for Working with HFC-134a (R-134a)

WARNING:

쐌 CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants

are mixed, compressor failure is likely to occur, refer to “Contaminated Refrigerant”. To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant Recovery/ Recycling Recharging equipment (ACR4) (J-39500–NI) and Refrigerant Identifier.

쐌 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.

쐌 The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-

lowing handling precautions must be observed:

a) When removing refrigerant components from a vehicle, immediately cap (seal) the component to

minimize the entry of moisture from the atmosphere.

b) When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just

before connecting the components. Connect all refrigerant loop components as quickly as possible to minimize the entry of moisture into system.

c) 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.

d) Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose

and throat. Remove R-134a from the A/C system, using certified 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.

e) Do not allow lubricant (Nissan A/C System Oil Type S) to come in contact with styrofoam parts.

Damage may result.

=NDHA0002

Contaminated Refrigerant

If a refrigerant other than pure R-134a is identified in a vehicle, your options are:

쐌 Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into

the atmosphere.

쐌 Explain that recovery of the contaminated refrigerant could damage your service equipment and refriger-

ant supply.

쐌 Suggest the customer return the vehicle to the location of previous service where the contamination may

have occurred.

쐌 If you choose to perform the repair, recover the refrigerant using only 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.

쐌 If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact Nissan

Customer Affairs for further assistance.

Precautions for Leak Detection Dye

쐌 The A/C system contains a fluorescent leak detection dye used for locating refrigerant leaks. An ultravio-

let (UV) lamp is required to illuminate the dye when inspecting for leaks.

쐌 Always wear fluorescence enhancing UV safety glasses to protect your eyes and enhance the visibility of

the fluorescent dye.

쐌 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).

쐌 Always remove any dye from the leak area after repairs are complete to avoid a misdiagnosis during a

future service.

쐌 Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled,

clean immediately with the approved dye cleaner. Fluorescent dye left on a surface for an extended period of time cannot be removed.

쐌 Do not spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.). 쐌 Do not use more than one refrigerant dye bottle (1/4 ounce / 7.4 cc) per A/C system. 쐌 Leak detection dyes for R-134a and R-12 A/C systems are different. Do not use R-134a leak detection

NDHA0266

NDHA0275

HA-4

PRECAUTIONS

General Refrigerant Precautions

dye in R-12 A/C systems or R-12 leak detection dye in R-134a A/C systems or A/C system damage may result.

쐌 The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure

occurs.

AUTO

General Refrigerant Precautions

WARNING:

쐌 Do not release refrigerant into the air. Use approved recovery/recycling equipment to capture the

refrigerant every time an air conditioning system is discharged.

쐌 Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or

air conditioning system.

쐌 Do not store or heat refrigerant containers above 52°C (125°F). 쐌 Do not heat a refrigerant container with an open flame; if container warming is required, place the

bottom of the container in a warm pail of water.

쐌 Do not intentionally drop, puncture, or incinerate refrigerant containers. 쐌 Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns. 쐌 Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent

suffocation.

쐌 Do not pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air condi-

tioning systems with compressed air during repair. Some mixtures of air and R-134a have been shown to be combustible at elevated pressures. These mixtures, if ignited, may cause injury or property damage. Additional health and safety information may be obtained from refrigerant manufacturers.

Precautions for Refrigerant Connection

A new type refrigerant connection has been introduced to all refrigerant lines except the following portion. 쐌 Front evaporator core connections.

FEATURES OF NEW TYPE REFRIGERANT CONNECTION

쐌 The O-ring is relocated in a groove for proper installation. This eliminates 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 relation to the contacting surface of the mating part to improve sealing characteristics.

쐌 The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby

facilitating piping connections.

NDHA0003

NDHA0004

NDHA0004S01

HA-5

IDX

WHA091

Precautions for Refrigerant Connection (Cont’d)

PRECAUTIONS

AUTO

SPRING LOCK COUPLING

NDHA0004S03

The spring lock coupling is a refrigerant line coupling held together by a garter spring inside a circular cage. When the coupling is connected, the flared end of the female fitting slips behind the garter spring inside the cage of the male fitting. The garter spring and cage prevent the flared end of the female fitting from pulling out of the cage. Three green O-rings are used to seal the three halves of the coupling. These O-rings are made of special material and must be replaced with an O-ring made of the same material. The O-rings normally used in refrigerant system connections are not the same material and should not be used with the spring lock coupling. Use only the specified O-ring for the spring lock coupling. For Removal and Installation, refer to

HA-145.

AHA430A

HA-6

PRECAUTIONS

AUTO

Precautions for Refrigerant Connection (Cont’d)

O-RING AND REFRIGERANT CONNECTION

=NDHA0004S02

IDX

HA-7

WHA216

PRECAUTIONS

Precautions for Refrigerant Connection (Cont’d)

AUTO

CAUTION:

Refrigerant connections in some systems use different O-ring configurations. Do not confuse O-rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at, or around, the connection.

O-Ring Part Numbers and Specifications

Connection type

New A 92477 7B003 6.45 (0.2539) 2.62 (0.1031) New B 92477 0B000 7.37 (0.2902) 1.81 (0.0713) New C 92477 0B003 8.03 (0.3161) 1.96 (0.0772) New D 92477 7B001 9.19 (0.3618) 2.62 (0.1031) New E 92477 7B004 9.25 (0.3642) 1.78 (0.0701) New F 92477 0B001 10.16 (0.4000) 1.85 (0.0728) New G 92477 7B005 11.60 (0.4567) 2.62 (0.1031)

SHA814E

*: Always check with the Parts Department for the latest parts information

New H 92477 0B002 12.93 (0.5091) 1.86 (0.0732) New J 92477 7B002 15.67 (0.6169) 1.93 (0.0760) New K 92785 0B700 20.25 (0.7972) 3.53 (0.1390)

O-ring

size

Part number* D mm (in) W mm (in)

NDHA0004S0201

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. 쐌 When the compressor is removed, store it in the same position as it is when mounted on the car.

Failure to do so will cause lubricant to enter the low pressure chamber.

쐌 When connecting tubes, always use a torque wrench and a back-up wrench. 쐌 After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture. 쐌 When installing an air conditioner in the vehicle, connect the pipes as the final stage of the opera-

tion. Do not remove the seal caps of pipes and other components until just before required for connection.

쐌 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.

쐌 Thoroughly remove moisture from the refrigeration system before charging the refrigerant. 쐌 Always replace used O-rings. 쐌 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: Nissan A/C System Oil Type F Part number*: KLH00-PAGQU

쐌 O-ring must be closely attached to dented portion of tube. 쐌 When replacing the O-ring, be careful not to damage O-ring and tube. 쐌 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.

쐌 After connecting line, conduct leak test and make sure that there is no leakage from connections.

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.

*: Always check with the Parts Department for the latest parts information

HA-8

PRECAUTIONS

AUTO

Precautions for Servicing Compressor

RHA861F

Precautions for Servicing Compressor

쐌 Plug all openings to prevent moisture and foreign matter from entering. 쐌 When the compressor is removed, store it in the same position as it is when mounted on the car. 쐌 When replacing or repairing compressor, follow “Maintenance of Lubricant Quantity in Compres-

sor” exactly. Refer to HA-124.

쐌 Keep friction surfaces between clutch and pulley clean. If the surface is contaminated, with

lubricant, wipe it off by using a clean waste cloth moistened with thinner.

쐌 After compressor service operation, turn the compressor shaft by hand more than five turns in

both directions. This will equally distribute lubricant inside the compressor. After the compressor is installed, let the engine idle and operate the compressor for one hour.

쐌 After replacing the compressor magnet clutch, apply voltage to the new one and check for normal

operation.

Precautions for Service Equipment

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 manufacture’s instructions for tester operation and tester maintenance.

NDHA0005

NDHA0006

NDHA0006S01

NDHA0006S02

HA-9

IDX

Precautions for Service Equipment (Cont’d)

PRECAUTIONS

AUTO

RHA270D

VACUUM PUMP

NDHA0006S03

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 vacuum pump is exposed to atmospheric pressure. 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.

쐌 Usually vacuum pumps have a manual isolator valve as part

of the pump. Close this valve to isolate the service hose from the pump.

쐌 For pumps without an isolator, use a hose equipped with a

manual shut-off valve near the pump end. Close the valve to isolate the hose from the pump.

쐌 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 condition. Such valves may restrict the pump’s ability to pull a deep vacuum and are not recommended.

MANIFOLD GAUGE SET

NDHA0006S04

Be certain that the gauge face indicates R-134a or 134a. Make sure the gauge set has 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.

SHA533D

RHA272D

RHA273D

SERVICE HOSES

NDHA0006S05

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.

SERVICE COUPLERS

NDHA0006S06

Never attempt to connect HFC-134a (R-134a) service couplers 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

HA-10

PRECAUTIONS

AUTO

Precautions for Service Equipment (Cont’d)

RHA274D

REFRIGERANT WEIGHT SCALE

Verify that no refrigerant other than HFC-134a (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.

CALIBRATING ACR4 WEIGHT SCALE

Calibrate the scale every 3 months. To calibrate the weight scale on the ACR4 (J-39500–NI):

1. Press Shift/Reset and Enter at the same time.

2. Press 8787. “A1” will be displayed.

3. Remove all weight from the scale.

4. Press 0, then press Enter. “0.00” will be displayed and changed to “A2”.

5. Place a knownweight (dumbbell or similar weight), between 10 and 19 lbs., on the center of the weight scale.

6. Enter the known weight using 4 digits. (Example 10 lbs =

10.00, 10.5 lbs = 10.50)

7. Press Enter — the display returns to the vacuum mode.

8. Press Shift/Reset and Enter at the same time.

9. Press 6 — the known weight on the scale is displayed.

10. Remove the known weight from the scale. “0.00” will be displayed.

11. Press Shift/Reset to return the ACR4 to the program mode.

NDHA0006S07

NDHA0006S10

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 scale or of quality recycle/recharge equipment.

THERMOMETER AND HYGROMETER

An etched stem-type thermometer and a hygrometer can be used to check the air conditioning system performance. A hygrometer is used because the air conditioning performance depends on the humidity.

NDHA0006S08

NDHA0006S09

IDX

AHA274

HA-11

Wiring Diagrams and Trouble Diagnosis

PRECAUTIONS

AUTO

Wiring Diagrams and Trouble Diagnosis

When you read wiring diagrams, refer to the followings:

쐌 “HOW TO READ WIRING DIAGRAMS”, GI-10 쐌 “POWER SUPPLY ROUTING”, EL-10

When you perform trouble diagnosis, refer to the followings:

쐌 “HOW TO FOLLOW TEST GROUP IN TROUBLE DIAGNOSIS”, GI-34 쐌 “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT”, GI-23

NDHA0007

HA-12

Tool number (Kent-Moore No.) Tool name

HFC-134a (R-134a) refrigerant

Description

PREPARATION

HFC-134a (R-134a) Service Tools and Equipment

AUTO

HFC-134a (R-134a) Service Tools and Equipment

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 container fittings, service hose fittings and service equipment fittings (equipment which handles 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 convert one size fitting to another must never be used: refrigerant/lubricant contamination will occur and compressor failure will result.

Container color: Light blue Container marking: HFC-134a (R-134a) Fitting size: Thread size 쐌 large container 1/2″-16 ACME

=NDHA0009

KLH00-PAGQU KLH00-PAGQF ( — ) Nissan A/C System Oil Type F

(J-39500-NI) Recovery/Recycling Recharging equipment (ACR4)

(J-41995) Electronic refrigerant leak detector

NT196

NT197

NT195

Type: Poly alkylene glycol oil (PAG), type F Application: HFC-134a (R-134a) swash plate (piston) compressors (Nissan only) Lubricity: 206 m (7.0 US fl oz, 7.3 Imp fl oz) 295 m (10.0 US fl oz, 10.4 Imp fl oz)

Function: Refrigerant Recovery and Recycling and Recharging

Function: Checks for refrigerant leaks.

AHA281A

IDX

HA-13

PREPARATION

HFC-134a (R-134a) Service Tools and Equipment (Cont’d)

Tool number (Kent-Moore No.) Tool name

Description

AUTO

(J-39183) Manifold gauge set (with hoses and couplers)

Service hoses 쐌 High side hose

(J-39501-72)

쐌 Low side hose

(J-39502-72)

쐌 Utility hose

(J-39476-72)

Service couplers 쐌 High side coupler

(J-39500-20)

쐌 Low side coupler

(J-39500-24)

(J-39650) Refrigerant weight scale

Identification: 쐌 The gauge face indicates R-134a. Fitting size: Thread size 쐌 1/2″-16 ACME

NT199

Hose color:

쐌 Low hose: Blue with black stripe 쐌 High hose: Red with black stripe 쐌 Utility hose: Yellow with black stripe or green

with black stripe Hose fitting to gauge: 쐌 1/2″-16 ACME

NT201

Hose fitting to service hose: 쐌 M14 x 1.5 fitting is optional or permanently

attached.

NT202

For measuring of refrigerant Fitting size: Thread size 쐌 1/2″-16 ACME

(J-39649) Vacuum pump (Including the isolator valve)

(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 R-134a refrigerant dye (J-43872) Refrigerant dye cleaner

NT200

Capacity:

쐌 Air displacement: 4 CFM 쐌 Micron rating: 20 microns 쐌 Oil capacity: 482 g (17 oz)

Fitting size: Thread size 쐌 1/2″-16 ACME

NT203

Power supply: DC 12V (Battery terminal)

LHA176

HA-14

Tool number (Kent-Moore No.) Tool name

Description

PREPARATION

HFC-134a (R-134a) Service Tools and Equipment (Cont’d)

AUTO

(J-42220) Fluorescent dye leak detector

(J-41447) R134a fluorescent leak detection dye (Box of 24, 1/4 ounce bottles)

(J-41459) R134a dye injector Use with J-41447, 1/4 ounce bottle

(J-43872) Dye cleaner

LHA177

LHA178

LHA179

Power supply: DC12V (Battery terminal) For checking refrigerant leak when fluorescent dye is installed in A/C system Includes: UV lamp and UV safety glasses

Application: For R-134a PAG oil Container: 1/4 ounce (7.4 cc) bottle (Includes self-adhesive dye identification labels for affixing to vehicle after charging system with dye)

For injecting 1/4 ounce (7.4 cc) of Fluorescent Leak Detection Dye into A/C system

For cleaning dye spills

LHA180

IDX

HA-15

Commercial Service Tools

PREPARATION

AUTO

Commercial Service Tools

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool name Description Note Additional Valve For discharging, evacuating and charging refriger-

ant

SHA898C

Thermometer and hygrometer

SHA900C

Spring lock coupling remover

For checking temperature and humidity

For disconnecting spring lock coupling

쐌 3/8″ 쐌 1/2″ 쐌 5/8″ 쐌 3/4″

=NDHA0008

Snap ring remover

Shaft seal remover

Shaft seal protector

Shaft seal installer

Coil remover

AHA283

For removing snap rings from compressor

AHA284

For removing shaft seal from compressor

AHA285

For protecting compressor shaft seal during shaft seal installation

AHA286

For installing compressor shaft seal

AHA287

For removing compressor magnet clutch coil

HA-16

AHA288

PREPARATION

Tool name Description Note

AUTO

Commercial Service Tools (Cont’d)

Spanner wrench

Coil pressing tool

Puller

Refrigerant Identifier Equipment

AHA289

AHA290

AHA291

For removing compressor clutch hub retaining bolt

For installing compressor magnet clutch coil

For removing and installing compressor magnet clutch coil

Checks refrigerant purity and for system contamination

NT765

For details of handling methods, refer to the Instruction Manual attached to each of the service tools.

IDX

HA-17

DESCRIPTION

Refrigeration System

AUTO

Refrigeration System

REFRIGERATION CYCLE Refrigerant Flow

The refrigerant flows in the standard pattern, that is, through the compressor, the condenser, orifice tube and/or thermal expansion valve, through the evaporator, the accumulator (from orifice tube), and back to the compressor. The refrigerant evaporation through the evaporator coil is controlled by an orifice tube or an externally equalized expansion valve, located outside the evaporator case.

NDHA0010

NDHA0010S01

Freeze Protection

NDHA0010S02

Under normal operating conditions, when the A/C is switched on, the compressor runs continuously, and the evaporator pressure, and therefore temperature, is controlled by the compressor to prevent freeze up.

Refrigerant System Protection

High-pressure switch

NDHA0010S03

NDHA0010S0301

The refrigerant system is protected against excessively high pressure by a high-pressure switch, located on the end of the compressor. If the system pressure rises above the specifications, the high-pressure switch opens to interrupt the compressor operation and a set of contacts close to switch the cooling fan on high. Refer to “Air Conditioner High Pressure Switch”, EC-560 and “High Pressure Switch”, HA-104.

Low-pressure switch

NDHA0010S0304

The refrigerant system is protected against excessively low pressure by the low-pressure switch, located on the accumulator. If the system pressure falls below the specifications, the low-pressure switch opens to interrupt the compressor operation. When the outside temperature is below 4°C (40°F) the low pressure switch opens to interrupt the compressor operation. Refer to “Low Pressure Switch”, HA-103.

Pressure Relief Valve

NDHA0010S0302

The refrigerant system is also protected by a pressure relief valve located on the flexible high pressure hose near the compressor. When the pressure of refrigerant in the system increases to an abnormal level [more than 3,727 kPa (38 kg/cm

, 540 psi)], the release port on the pressure relief valve automatically opens and

releases refrigerant into the atmosphere.

HA-18

DESCRIPTION

AUTO

Refrigeration System (Cont’d)

HA-19

IDX

AHA432A

Component Layout

DESCRIPTION

AUTO

Component Layout

NDHA0012

HA-20

AHA405A

DESCRIPTION

AUTO

Component Layout (Cont’d)

WHA049

HA-21

IDX

Introduction

DESCRIPTION

AUTO

Introduction

=NDHA0013

The Electronic Automatic Temperature Control (EATC) system provides automatic regulation of the vehicle’s interior temperature. The system is based on the operator selected “set temperature”, regardless of the outside temperature changes. This is done by utilizing a microcomputer, also referred to as the EATC unit, which receives input signals from the following five sensors:

쐌 Ambient temperature sensor 쐌 In-vehicle temperature sensor 쐌 Engine coolant ambient temperature sensor 쐌 Sunload sensor 쐌 PBR (Potentio Balance Resistor).

The EATC unit uses these input signals (including the set temperature) to automatically control:

쐌 Outlet air volume 쐌 Air temperature 쐌 Air distribution.

Features

AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)

NDHA0014

NDHA0014S01

The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined value by the temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.

FRONT FAN SPEED CONTROL

NDHA0014S02

The front blower speed is automatically controlled based on temperature setting, ambient temperature, in–vehicle temperature and amount of sunload. When the EATC unitis set toAUTOMATIC, the blower motor starts togradually increase air flow volume. When engine coolant temperature is low and vehicle interior warming is required under cold ambient conditions the blower motor operation is delayed to prevent cool air from flowing.

REAR FAN SPEED CONTROL

NDHA0014S09

The rear blower speed can be controlled from the EATC unit or from the rear A/C control unit, when the rear fan switch (front) is set to REAR.

FRONT INTAKE DOOR CONTROL

NDHA0014S04

When AUTOMATIC mode is selected, the front intake door is automatically controlled by: The temperature setting, ambient temperature, in-vehicle temperature and amount of sunload. The ON-OFF operation of the MAX A/C switch will allow manual control of the front intake door. The front intake door is set to the FRESH position when DEF or F/D mode is selected.

OUTLET DOOR CONTROL

NDHA0014S05

The front mode outlet doors are automatically controlled by: The temperature setting, ambient temperature, in-vehicle temperature, and amount of sunload.

MAGNET CLUTCH CONTROL

NDHA0014S06

The ECM controls compressor ON-OFF operation using signals from the throttle position sensor,low-pressure switch, high-pressure switch, engine coolant temperature sensor and EATC unit.

SELF-DIAGNOSTICS SYSTEM

NDHA0014S08

The self-diagnostic system is built into the EATC unit to quickly locate the cause of problems.

HA-22

DESCRIPTION

AUTO

Overview of Control System

The control system consists of:

쐌 Input sensors and switches, 쐌 Electronic Automatic Temperature Control unit (microcomputer) 쐌 Actuators

The relationship of these components is shown in the diagram below:

=NDHA0015

IDX

HA-23

AHA433A

Control Operation

DESCRIPTION

AUTO

Control Operation

NDHA0016

WHA006

AUTO SWITCH

NDHA0016S01

The following components are automatically controlled so that in-vehicle temperature will reach and maintain the set temperature.

쐌 Compressor 쐌 Air intake door 쐌 Air mix door 쐌 Mode doors 쐌 Blower speed

The air conditioner cooling function operates only when the engine is running.

TEMPERATURE CONTROL SWITCH

NDHA0016S02

Increases or decreases the set temperature.

OFF SWITCH

NDHA0016S03

The compressor, front and rear blower motors are off, the front intake door is set to the recirculation position, and the mode doors remain in their previous positions.

FRONT FAN SWITCH

NDHA0016S04

Manual control of the front blower speed can be obtained by rotating the front fan switch. The fan symbol (

) will be shown in the display screen.

REAR FAN SWITCH

NDHA0016S05

When the rear fan switch (front) is in the OFF position, the rear blower motor cannot operate. When the rear fan switch (front) is in the REAR position, it allows the rear fan switch to control the rear blower speed. In any other position (1–4), the rear fan switch (front) controls the rear blower speed regardless of the rear fan switch position.

HA-24

DESCRIPTION

AUTO

Control Operation (Cont’d)

MODE SWITCH

Manual control of the air discharge outlets. Five selections are available: FACE (

DEF ( operates at ambient temperature approx. 4°C (40°F) or above.

), BI-LEVEL “B/L” ( ), FOOT ( ), FOOT and DEFROST “F/D” ( ), and DEFROST ( ).

) or F/D ( ) positions the front intake door to the outside air FRESH position. The compressor

MAX A/C SWITCH

ON position: Interior air is recirculated inside the vehicle. OFF position: Automatic control resumes. MAX A/C is canceled when DEF (

) or F/D ( ) is selected

AIR CONDITIONER SWITCH

This switch controls A/C operation when any mode switch is selected except OFF or AUTOMATIC mode is selected the indicator light will be off and A/C operation is automatically controlled.

The air conditioner cooling function operates only when the engine is running.

NDHA0016S06

NDHA0016S07

NDHA0016S08

IDX

HA-25

Discharge Air Flow

DESCRIPTION

AUTO

Discharge Air Flow

NDHA0017

HA-26

WHA050

TROUBLE DIAGNOSES

AUTO

Component Location

ENGINE COMPARTMENT

Component Location

NDHA0029

NDHA0029S01

IDX

HA-27

AHA294A

Component Location (Cont’d)

TROUBLE DIAGNOSES

AUTO

PASSENGER COMPARTMENT

NDHA0029S02

HA-28

AHA295A

TROUBLE DIAGNOSES

AUTO

Component Location (Cont’d)

HA-29

IDX

WHA007

Circuit Diagram — Auto Air Conditioner

TROUBLE DIAGNOSES

AUTO

Circuit Diagram — Auto Air Conditioner

NDHA0030

HA-30

WHA207

+ 228 hidden pages