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MTC

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J AIR CONDITIONER

B
SECTION
MANUAL AIR CONDITIONER C

E
CONTENTS
PRECAUTIONS ......................................................... 3
. AIR CONDITIONER CONTROL .............................. 22 . F
Precautions for Supplemental Restraint System Control Operation .................................................. 22
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- FAN CONTROL KNOB ....................................... 22 .
SIONER" ................................................................. 3
. MODE CONTROL KNOB ................................... 22 . G
Precautions for Working with HFC-134a (R-134a) 3 ..... TEMPERATURE CONTROL KNOB ................... 22 .
Contaminated Refrigerant ....................................... 4 . RECIRCULATION (REC) SWITCH .................... 22 .
General Refrigerant Precautions ............................. 4 . AIR CONDITIONER SWITCH ............................ 22 .
H
Precautions for Leak Detection Dye ........................ 4 . REAR WINDOW DEFOGGER SWITCH (IF
A/C Identification Label ........................................... 5
. EQUIPPED) ........................................................ 22
.
Precautions for Refrigerant Connection .................. 5 . Discharge Air Flow ................................................ 23
.
FEATURES OF NEW TYPE REFRIGERANT TROUBLE DIAGNOSIS ........................................... 24 . I
CONNECTION ..................................................... 5. How to Perform Trouble Diagnoses for Quick and
O-RING AND REFRIGERANT CONNECTION..... 6 Accurate Repair ..................................................... 24
.
Precautions for Servicing Compressor .................... 8 . WORK FLOW ..................................................... 24 . MTC
Precautions for Service Equipment ......................... 8 . SYMPTOM TABLE ............................................. 24 .
RECOVERY/RECYCLING EQUIPMENT ............. 8 . Component Location ............................................. 25 .
ELECTRONIC LEAK DETECTOR ....................... 8 . ENGINE COMPARTMENT ................................. 25 .
K
VACUUM PUMP .................................................. 9 . PASSENGER COMPARTMENT ........................ 28 .
MANIFOLD GAUGE SET ..................................... 9 . Wiring Diagram -- Heater -- ................................. 29 .
SERVICE HOSES ................................................ 9 . Wiring Diagram -- A/C -- ...................................... 30 .
SERVICE COUPLERS ....................................... 10 . Operational Check ................................................. 32
. L
REFRIGERANT WEIGHT SCALE ..................... 10 . CONDITIONS: .................................................... 32.
CALIBRATING ACR4 WEIGHT SCALE ............. 10 . PROCEDURE: ................................................... 32 .
CHARGING CYLINDER ..................................... 10 . Mode Door ............................................................. 34
. M
THERMOMETER AND HYGROMETER .............11 . TROUBLE DIAGNOSIS PROCEDURE FOR
Wiring Diagrams and Trouble Diagnosis ................11 . MODE DOOR ..................................................... 34 .
PREPARATION ........................................................ 12
. MODE DOOR CONTROL LINKAGE ADJUST-
Special Service Tools ............................................ 12
. MENT ................................................................. 35
.
HFC-134a (R-134a) Service Tools and Equipment 13 ... Intake Door ............................................................ 36
.
Commercial Service Tool ...................................... 16 . TROUBLE DIAGNOSIS PROCEDURE FOR
REFRIGERATION SYSTEM .................................... 17 . INTAKE DOOR ................................................... 36 .
Refrigeration Cycle ................................................ 17
. INTAKE DOOR CIRCUIT ................................... 37 .
REFRIGERANT FLOW ...................................... 17 . CONTROL LINKAGE ADJUSTMENT ................ 38 .
FREEZE PROTECTION .................................... 17 . Blower Motor ......................................................... 39
.
REFRIGERANT SYSTEM PROTECTION ......... 17 . TROUBLE DIAGNOSIS PROCEDURE FOR
Component Layout ................................................ 18. BLOWER MOTOR ............................................. 39 .
LUBRICANT ............................................................ 19
. BLOWER MOTOR CIRCUIT .............................. 39 .
Maintenance of Lubricant Quantity in Compressor 19 ... ELECTRICAL COMPONENTS INSPECTION .... 43 .
LUBRICANT ....................................................... 19
. Magnet Clutch ....................................................... 44
.
CHECKING AND ADJUSTING .......................... 19 . TROUBLE DIAGNOSIS PROCEDURE FOR

MTC-1
MAGNET CLUTCH ............................................. 44 . KA24DE MODELS ..............................................69 .
MAGNET CLUTCH CIRCUIT ............................. 45 . VG33E AND VG33ER MODELS ........................69 .
ELECTRICAL COMPONENTS INSPECTION .... 49 . Removal and Installation for Compressor Clutch ...70
Insufficient Cooling ................................................ 51. KA24DE MODELS ..............................................70 .
TROUBLE DIAGNOSIS PROCEDURE FOR VG33E AND VG33ER MODELS ........................70 .
INSUFFICIENT COOLING ................................. 51 . Removal .................................................................71
.
PERFORMANCE TEST DIAGNOSES ............... 52 . Inspection ...............................................................72
.
PERFROMANCE CHART .................................. 54 . CLUTCH DISC ....................................................72 .
TROUBLE DIAGNOSES FOR ABNORMAL PULLEY ..............................................................72
.
PRESSURE ........................................................ 55 . COIL ....................................................................72
.
Insufficient Heating ................................................ 59. Installation ..............................................................72
.
TROUBLE DIAGNOSIS PROCEDURE FOR BREAK-IN OPERATION .....................................73 .
INSUFFICIENT HEATING .................................. 59 . Thermal Protector Inspection .................................74 .
TEMPERATURE CONTROL LINKAGE Removal and Installation for Evaporator ................74 .
ADJUSTMENT ................................................... 60 . REMOVAL ...........................................................74 .
Noise ..................................................................... 61
. INSTALLATION ...................................................75 .
TROUBLE DIAGNOSIS PROCEDURE FOR Checking for Refrigerant Leaks .............................75 .
NOISE ................................................................ 61
. PRELIMINARY CHECK ......................................75 .
Intake Sensor ......................................................... 62
. Fluorescent Dye Leak Detector .............................75 .
COMPONENT DESCRIPTION ........................... 62 . PRECAUTIONS FOR FLUORESCENT DYE
DIAGNOSTIC PROCEDURE ............................. 62 . LEAK DETECTION .............................................75 .
REMOVAL AND INSTALLATION ........................ 63 . CHECKING SYSTEM FOR LEAKS USING THE
IN-CABIN MICROFILTER ........................................ 64 . FLUORESCENT LEAK DETECTOR ..................75 .
Removal and Installation ....................................... 64 . DYE INJECTION .................................................75 .
FUNCTION ......................................................... 64 . Electronic Refrigerant Leak Detector .....................76 .
REPLACEMENT TIMING ................................... 64 . PRECAUTIONS FOR HANDLING LEAK
REPLACEMENT PROCEDURES ...................... 64 . DETECTOR ........................................................76 .
HEATER CORE ........................................................ 65 . CHECKING PROCEDURE .................................77 .
Removal and Installation ....................................... 65 . SERVICE DATA AND SPECIFICATIONS (SDS) .....79 .
REMOVAL .......................................................... 65 . General Specifications ...........................................79 .
INSTALLATION ................................................... 65 . COMPRESSOR ..................................................79 .
REFRIGERANT LINES ............................................ 66 . LUBRICANT ........................................................79 .
HFC-134a (R-134a) Service Procedure ................ 66 . REFRIGERANT ..................................................79 .
SETTING OF SERVICE TOOLS AND EQUIP- Inspection and Adjustment .....................................79 .
MENT ................................................................. 66
. ENGINE IDLING SPEED (WHEN A/C IS ON) ....79 .
Components .......................................................... 68. BELT TENSION ..................................................79 .
Removal and Installation for Compressor .............. 69 . MAGNET CLUTCH .............................................79 .

MTC-2
PRECAUTIONS

PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS001H4

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 may include seat belt switch inputs and dual stage front air bag modules. If
equipped with dual stage front air bag modules, the SRS system uses the seat belt switches to determine the C
front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and
whether the front occupants are belted or unbelted. Information necessary to service the system safely is
included in the SRS and SB section of this Service Manual.
D
The vehicle may be equipped with a passenger air bag deactivation switch. Because no rear seat exists where
a rear-facing child restraint can be placed, the switch is designed to turn off the passenger air bag so that a
rear-facing child restraint can be used in the front passenger seat. The switch is located in the center of the E
instrument panel, near the ashtray. When the switch is turned to the ON position, the passenger air bag is
enabled and could inflate for certain types of collision. When the switch is turned to the OFF position, the pas-
senger air bag is disabled and will not inflate. A passenger air bag OFF indicator on the instrument panel lights
up when the passenger air bag is switched OFF. The driver air bag always remains enabled and is not affected F
by the passenger air bag deactivation switch.

WARNING: G
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. H
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.
I
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.
MTC
q The vehicle may be equipped with a passenger air bag deactivation switch which can be operated
by the customer. When the passenger air bag is switched OFF, the passenger air bag is disabled
and will not inflate. When the passenger air bag is switched ON, the passenger air bag is enabled
and could inflate for certain types of collision. After SRS maintenance or repair, make sure the K
passenger air bag deactivation switch is in the same position (ON or OFF) as when the vehicle
arrived for service.
Precautions for Working with HFC-134a (R-134a) EJS0010Z
L

WARNING:
q 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 MTC-4, "Contaminated Refrigerant" . To M
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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