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MTC


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J AIR CONDITIONER

                                                                                                                                                              A


                                                                                                                                                              B
                                                                               SECTION
                                                                      MANUAL AIR CONDITIONER                                                                  C


                                                                                                                                                              D


                                                                                                                                                              E
                                                               CONTENTS
PRECAUTIONS ......................................................... 3
                                                                      .        LUBRICANT ............................................................. 20
                                                                                                                                                     .        F
 Precautions for Supplemental Restraint System                                  Maintenance of Lubricant Quantity in Compressor 20                   ...
 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                          LUBRICANT ....................................................... 20
                                                                                                                                                     .
 SIONER" ................................................................. 3
                                                                      .           CHECKING AND ADJUSTING ........................... 20              .        G
 Precautions for Working with HFC-134a (R-134a) 3                     .....    AIR CONDITIONER CONTROL .............................. 23             .
 Contaminated Refrigerant ....................................... 3   .         Control Operation .................................................. 23
                                                                                                                                                     .
 General Refrigerant ................................................. 4
                                                                      .           FAN CONTROL KNOB ....................................... 23        .
                                                                                                                                                              H
 Precautions for Leak Detection Dye ........................ 4        .           MODE CONTROL KNOB ................................... 23           .
 A/C Identification Label ........................................... 4
                                                                      .           TEMPERATURE CONTROL KNOB ................... 23                    .
 Precautions for Refrigerant Connection .................. 5          .           RECIRCULATION (REC) SWITCH .................... 23                 .
   FEATURES OF NEW TYPE REFRIGERANT                                               AIR CONDITIONER SWITCH ............................ 23             .         I
   CONNECTION ..................................................... 5 .           REAR WINDOW DEFOGGER SWITCH ............ 23                        .
   O-RING AND REFRIGERANT CONNECTION..... 6                                     Discharge Air Flow ................................................ 24
                                                                                                                                                     .
 Precautions for Servicing Compressor .................... 8          .        TROUBLE DIAGNOSIS ........................................... 25      .        MTC
 Precautions for Service Equipment ......................... 8        .         How to Perform Trouble Diagnoses for Quick and
   RECOVERY/RECYCLING EQUIPMENT ............. 8                       .         Accurate Repair ..................................................... 25
                                                                                                                                                     .
   ELECTRONIC LEAK DETECTOR ....................... 8                 .           WORK FLOW ..................................................... 25 .
                                                                                                                                                              K
   VACUUM PUMP .................................................. 9   .           SYMPTOM TABLE ............................................. 25     .
   MANIFOLD GAUGE SET ..................................... 9         .         Component Location ............................................. 26  .
   SERVICE HOSES ................................................ 9   .           ENGINE COMPARTMENT ................................. 26            .
   SERVICE COUPLERS ....................................... 10        .           ENGINE COMPARTMENT ................................. 27            .        L
   REFRIGERANT WEIGHT SCALE ..................... 10                  .           PASSENGER COMPARTMENT ........................ 29                  .
   CALIBRATING ACR4 WEIGHT SCALE ............. 10                     .         Wiring Diagram -- A/C -- ...................................... 30   .
   CHARGING CYLINDER ..................................... 10         .         Operational Check ................................................. 32
                                                                                                                                                     .        M
   THERMOMETER AND HYGROMETER .............11                         .           CONDITIONS: .................................................... 32.
 Wiring Diagrams and Trouble Diagnosis ................11             .           PROCEDURE: ................................................... 32  .
PREPARATION ........................................................ 12
                                                                      .         Mode Door ............................................................. 34
                                                                                                                                                     .
 Special Service Tools ............................................ 12.           TROUBLE DIAGNOSIS PROCEDURE FOR
 HFC-134a (R-134a) Service Tools and Equipment 13                     ...         MODE DOOR ..................................................... 34 .
 Commercial Service Tool ...................................... 16    .           MODE DOOR CONTROL LINKAGE ADJUST-
REFRIGERATION SYSTEM .................................... 17          .           MENT ................................................................. 35
                                                                                                                                                     .
 Refrigeration Cycle ................................................ 17
                                                                      .         Intake Door ............................................................ 36
                                                                                                                                                     .
   REFRIGERANT FLOW ...................................... 17         .           TROUBLE DIAGNOSIS PROCEDURE FOR
   FREEZE PROTECTION .................................... 17          .           INTAKE DOOR ................................................... 36 .
   REFRIGERANT SYSTEM PROTECTION ......... 17                         .           INTAKE DOOR CIRCUIT ................................... 37         .
 Component Layout ................................................ 18 .           CONTROL LINKAGE ADJUSTMENT ................ 38                     .
   FRONT ............................................................... 18
                                                                      .         Blower Motor ......................................................... 39
                                                                                                                                                     .
   REAR ................................................................. 19
                                                                      .           TROUBLE DIAGNOSIS PROCEDURE FOR
                                                                                  BLOWER MOTOR .............................................. 39     .
                                                                                  BLOWER MOTOR CIRCUIT .............................. 39             .


                                                                        MTC-1
    ELECTRICAL COMPONENTS INSPECTION .... 43                              .           MENT ..................................................................65
                                                                                                                                                          .
  Magnet Clutch ....................................................... 44.         Components ...........................................................67
                                                                                                                                                          .
    TROUBLE DIAGNOSIS PROCEDURE FOR                                                 Removal and Installation for Compressor ..............68              .
    MAGNET CLUTCH ............................................. 44        .           KA24DE MODELS ..............................................68      .
    MAGNET CLUTCH CIRCUIT ............................. 45                .           VG33E AND VG33ER MODELS ........................68                  .
    ELECTRICAL COMPONENTS INSPECTION .... 49                              .         Removal and Installation for Compressor Clutch ...69
  Insufficient Cooling ................................................ 51.           KA24DE MODELS ..............................................69      .
    TROUBLE DIAGNOSIS PROCEDURE FOR                                                   VG33E AND VG33ER MODELS ........................69                  .
    INSUFFICIENT COOLING ................................. 51             .           REMOVAL ...........................................................70
                                                                                                                                                          .
    PERFORMANCE TEST DIAGNOSIS ................ 52                        .           INSPECTION ......................................................71 .
    PERFORMANCE CHART .................................. 54               .           INSTALLATION ...................................................71  .
    TROUBLE DIAGNOSES FOR ABNORMAL                                                  Thermal Protector Inspection .................................73      .
    PRESSURE ........................................................ 55  .         Removal and Installation for Evaporator ................73            .
  Insufficient Heating ................................................ 58.           REMOVAL ...........................................................73
                                                                                                                                                          .
    TROUBLE DIAGNOSIS PROCEDURE FOR                                                   INSTALLATION ...................................................74  .
    INSUFFICIENT HEATING .................................. 58            .         Checking for Refrigerant Leaks .............................74        .
    TEMPERATURE CONTROL LINKAGE                                                       PRELIMINARY CHECK ......................................74          .
    ADJUSTMENT ................................................... 59     .         Electronic Refrigerant Leak Detector .....................74          .
  Noise ..................................................................... 60
                                                                          .           PRECAUTIONS FOR HANDLING LEAK
    TROUBLE DIAGNOSIS PROCEDURE FOR                                                   DETECTOR ........................................................74 .
    NOISE ................................................................ 60
                                                                          .           CHECKING PROCEDURE .................................75              .
  Intake Sensor ......................................................... 61
                                                                          .         Fluorescent Dye Leak Detector .............................76         .
    COMPONENT DESCRIPTION ........................... 61                  .           PRECAUTIONS FOR FLUORESCENT DYE
    DIAGNOSTIC PROCEDURE ............................. 61                 .           LEAK DETECTION .............................................76      .
    REMOVAL AND INSTALLATION ........................ 62                  .           CHECKING SYSTEM FOR LEAKS USING THE
IN-CABIN MICROFILTER ........................................ 63          .           FLUORESCENT LEAK DETECTOR ..................76                      .
  Removal and Installation ....................................... 63     .           DYE INJECTION .................................................77   .
    FUNCTION ......................................................... 63 .        SERVICE DATA AND SPECIFICATIONS (SDS) .....78                          .
    REPLACEMENT TIMING ................................... 63             .         General Specifications ...........................................78  .
    REPLACEMENT PROCEDURES ...................... 63                      .           COMPRESSOR ..................................................78     .
HEATER CORE ........................................................ 64   .           LUBRICANT ........................................................78.
  Removal and Installation ....................................... 64     .           REFRIGERANT ..................................................78    .
    REMOVAL .......................................................... 64 .         Inspection and Adjustment .....................................78     .
    INSTALLATION ................................................... 64   .           ENGINE IDLING SPEED (WHEN A/C IS ON) ....78                         .
REFRIGERANT LINES ............................................ 65         .           BELT TENSION ..................................................78   .
  HFC-134a (R-134a) Service Procedure ................ 65                 .           MAGNET CLUTCH .............................................78       .
    SETTING OF SERVICE TOOLS AND EQUIP-




                                                                            MTC-2
                                              PRECAUTIONS

PRECAUTIONS                                                         PFP:00001
                                                                                                                         A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER"                                                                                           EJS001GY


The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along                            B
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              C
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 Man-
ual.
WARNING:                                                                                                                 D
q    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 must be per-
     formed by an authorized NISSAN/INFINITI dealer.                                                                     E
q    Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
     sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
     Bag Module, see the SRS section.                                                                                    F
q    Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
     Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
     harness connectors.
                                                                                                                         G
Precautions for Working with HFC-134a (R-134a)                                                                EJS0018L


WARNING:
q CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants H
  are mixed, compressor failure is likely to occur. Refer to MTC-3, "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



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