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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 .............................. 21 . F
Precautions for Supplemental Restraint System Control Operation .................................................. 21
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- FAN CONTROL KNOB ....................................... 21 .
SIONER" ................................................................. 3
. MODE CONTROL KNOB ................................... 21 . G
Precautions for Working with HFC-134a (R-134a) 3 ..... TEMPERATURE CONTROL KNOB ................... 21 .
Contaminated Refrigerant ....................................... 3 . RECIRCULATION (REC) SWITCH .................... 21 .
General Refrigerant ................................................. 4
. AIR CONDITIONER SWITCH ............................ 21 .
H
Precautions for Leak Detection Dye ........................ 4 . REAR WINDOW DEFOGGER SWITCH ............ 21 .
A/C Identification Label ........................................... 4
. Discharge Air Flow ................................................ 22
.
Precautions for Refrigerant Connection .................. 5 . TROUBLE DIAGNOSIS ........................................... 23 .
FEATURES OF NEW TYPE REFRIGERANT How to Perform Trouble Diagnoses for Quick and I
CONNECTION ..................................................... 5 . Accurate Repair ..................................................... 23
.
O-RING AND REFRIGERANT CONNECTION..... 6 WORK FLOW ..................................................... 23 .
Precautions for Servicing Compressor .................... 8 . SYMPTOM TABLE ............................................. 23 . MTC
Precautions for Service Equipment ......................... 8 . Component Location ............................................. 24 .
RECOVERY/RECYCLING EQUIPMENT ............. 8 . ENGINE COMPARTMENT ................................. 24 .
ELECTRONIC LEAK DETECTOR ....................... 8 . ENGINE COMPARTMENT ................................. 25 .
K
VACUUM PUMP .................................................. 9 . PASSENGER COMPARTMENT ........................ 27 .
MANIFOLD GAUGE SET ..................................... 9 . Wiring Diagram -- A/C -- ...................................... 28 .
SERVICE HOSES ................................................ 9 . Operational Check ................................................. 30
.
SERVICE COUPLERS ....................................... 10 . CONDITIONS: .................................................... 30. L
CHARGING CYLINDER ..................................... 10 . PROCEDURE: ................................................... 30 .
THERMOMETER AND HYGROMETER ............ 10 . Mode Door ............................................................. 32
.
Wiring Diagrams and Trouble Diagnosis ............... 10 . TROUBLE DIAGNOSIS PROCEDURE FOR M
PREPARATION .........................................................11
. MODE DOOR ..................................................... 32 .
Special Service Tools .............................................11. MODE DOOR CONTROL LINKAGE ADJUST-
HFC-134a (R-134a) Service Tools and Equipment 12 ... MENT ................................................................. 33
.
Commercial Service Tool ...................................... 14 . Intake Door ............................................................ 34
.
REFRIGERATION SYSTEM .................................... 15 . TROUBLE DIAGNOSIS PROCEDURE FOR
Refrigeration Cycle ................................................ 15
. INTAKE DOOR ................................................... 34 .
REFRIGERANT FLOW ...................................... 15 . INTAKE DOOR CIRCUIT ................................... 35 .
FREEZE PROTECTION .................................... 15 . CONTROL LINKAGE ADJUSTMENT ................ 36 .
REFRIGERANT SYSTEM PROTECTION ......... 15 . Blower Motor ......................................................... 37
.
Component Layout ................................................ 16 . TROUBLE DIAGNOSIS PROCEDURE FOR
FRONT ............................................................... 16
. BLOWER MOTOR .............................................. 37 .
REAR ................................................................. 17
. BLOWER MOTOR CIRCUIT .............................. 37 .
LUBRICANT ............................................................ 18
. ELECTRICAL COMPONENTS INSPECTION .... 41 .
Maintenance of Lubricant Quantity in Compressor 18 ... Magnet Clutch ....................................................... 42
.
LUBRICANT ....................................................... 18
. TROUBLE DIAGNOSIS PROCEDURE FOR
CHECKING AND ADJUSTING .......................... 18 . MAGNET CLUTCH ............................................ 42 .

MTC-1
MAGNET CLUTCH CIRCUIT ............................. 43 . MENT ..................................................................63
.
ELECTRICAL COMPONENTS INSPECTION .... 47 . Components ...........................................................65
.
Insufficient Cooling ................................................ 49. Removal and Installation for Compressor ..............66 .
TROUBLE DIAGNOSIS PROCEDURE FOR Removal and Installation for Compressor Clutch ...67
INSUFFICIENT COOLING ................................. 49 . REMOVAL ...........................................................68
.
PERFORMANCE TEST DIAGNOSIS ................ 50 . INSPECTION AFTER REMOVAL .......................69 .
PERFORMANCE CHART .................................. 52 . INSTALLATION ...................................................69 .
TROUBLE DIAGNOSES FOR ABNORMAL BREAK-IN OPERATION .....................................70 .
PRESSURE ........................................................ 53 . Thermal Protector Inspection .................................71 .
Insufficient Heating ................................................ 56. Removal and Installation for Evaporator ................71 .
TROUBLE DIAGNOSIS PROCEDURE FOR REMOVAL ...........................................................71
.
INSUFFICIENT HEATING .................................. 56 . INSTALLATION ...................................................72 .
TEMPERATURE CONTROL LINKAGE Checking for Refrigerant Leaks .............................72 .
ADJUSTMENT ................................................... 57 . PRELIMINARY CHECK ......................................72 .
Noise ..................................................................... 58
. Fluorescent Dye Leak Detector .............................72 .
TROUBLE DIAGNOSIS PROCEDURE FOR PRECAUTIONS FOR FLUORESCENT DYE
NOISE ................................................................ 58
. LEAK DETECTION .............................................72 .
Intake Sensor ......................................................... 59
. CHECKING SYSTEM FOR LEAKS USING THE
COMPONENT DESCRIPTION ........................... 59 . FLUORESCENT LEAK DETECTOR ..................72 .
DIAGNOSTIC PROCEDURE ............................. 59 . DYE INJECTION .................................................72 .
REMOVAL AND INSTALLATION ........................ 60 . Electronic Refrigerant Leak Detector .....................73 .
IN-CABIN MICROFILTER ........................................ 61 . PRECAUTIONS FOR HANDLING LEAK
Removal and Installation ....................................... 61 . DETECTOR ........................................................73 .
FUNCTION ......................................................... 61 . CHECKING PROCEDURE .................................74 .
REPLACEMENT TIMING ................................... 61 . SERVICE DATA AND SPECIFICATIONS (SDS) .....76 .
REPLACEMENT PROCEDURES ...................... 61 . General Specifications ...........................................76 .
HEATER CORE ........................................................ 62 . COMPRESSOR ..................................................76 .
Removal and Installation ....................................... 62 . LUBRICANT ........................................................76.
REMOVAL .......................................................... 62 . REFRIGERANT ..................................................76 .
INSTALLATION ................................................... 62 . Inspection and Adjustment .....................................76 .
REFRIGERANT LINES ............................................ 63 . ENGINE IDLING SPEED (WHEN A/C IS ON) ....76 .
HFC-134a (R-134a) Service Procedure ................ 63 . BELT TENSION ..................................................76 .
SETTING OF SERVICE TOOLS AND EQUIP- MAGNET CLUTCH .............................................76 .

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 and Refrigerant Identifier. I
q 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.
q The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol- MTC
lowing handling precautions must be observed:

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