Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Sentra 2000-2005 Approved Nissan Sentra 2002 MTC
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J AIR CONDITIONER
A
B
SECTION
MANUAL AIR CONDITIONER C
D
E
CONTENTS
PRECAUTIONS ......................................................... 3
. Control Operation .................................................. 22
. F
Precautions for Supplemental Restraint System FAN CONTROL SWITCH ................................... 22 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- REAR WINDOW DEFOGGER SWITCH ............ 22 .
SIONER" ................................................................. 3
. MODE CONTROL KNOB ................................... 22 . G
Precautions for Working with HFC-134a (R-134a) 3 ..... TEMPERATURE CONTROL KNOB ................... 22 .
Contaminated Refrigerant ....................................... 3 . RECIRCULATION (REC) SWITCH .................... 22 .
General Refrigerant Precautions ............................. 4 . AIR CONDITIONER (A/C) SWITCH ................... 22 .
H
Precautions for Leak Detection Dye ........................ 4 . Discharge Air Flow ................................................ 23
.
A/C Identification Label ........................................... 4
. System Description ................................................ 24
.
Precautions for Refrigerant Connection .................. 5 . SWITCHES AND THEIR CONTROL FUNC-
FEATURES OF NEW TYPE REFRIGERANT TIONS ................................................................ 24
. I
CONNECTION ..................................................... 5. Component Location ............................................. 25 .
O-RING AND REFRIGERANT CONNECTION ..... 5 ENGINE COMPARTMENT ................................. 25 .
Precautions for Servicing Compressor .................... 8 . PASSENGER COMPARTMENT ........................ 26 . MTC
Precautions for Service Equipment ......................... 8 . Wiring Diagram -- Heater -- ................................. 27 .
RECOVERY/RECYCLING EQUIPMENT ............. 8 . Wiring Diagram -- A/C, M -- ................................. 28 .
ELECTRONIC LEAK DETECTOR ....................... 8 . QG18DE MODELS ............................................. 28 .
K
VACUUM PUMP .................................................. 9 . QR25DE MODELS ............................................. 32 .
MANIFOLD GAUGE SET ..................................... 9 . How to Perform Trouble Diagnoses for Quick and
SERVICE HOSES ................................................ 9 . Accurate Repair ..................................................... 35
.
SERVICE COUPLERS ....................................... 10 . WORK FLOW ..................................................... 35 . L
REFRIGERANT WEIGHT SCALE ..................... 10 . SYMPTOM TABLE ............................................. 35 .
CALIBRATING ACR4 WEIGHT SCALE ............. 10 . Operational Check ................................................. 37
.
CHARGING CYLINDER ..................................... 10 . CONDITIONS: .................................................... 37. M
Wiring Diagrams and Trouble Diagnosis ............... 10 . PROCEDURE: ................................................... 37 .
PREPARATION .........................................................11
. Main Power Supply and Ground Circuit Check ..... 39 .
Special Service Tools .............................................11
. POWER SUPPLY CIRCUIT CHECK .................. 39 .
HFC-134a (R-134a) Service Tools and Equipment 12 ... INTAKE DOOR ......................................................... 40
.
COMMERCIAL SERVICE TOOL ....................... 15 . Trouble Diagnosis Procedure for Intake Door ....... 40 .
REFRIGERATION SYSTEM .................................... 16 . Component Description ......................................... 40 .
Refrigeration Cycle ................................................ 16
. INTAKE DOOR MOTOR ..................................... 40 .
REFRIGERANT FLOW ...................................... 16 . Intake Door Motor Circuit ....................................... 41 .
FREEZE PROTECTION .................................... 16 . Control Linkage Adjustment .................................. 43 .
REFRIGERANT SYSTEM PROTECTION ......... 16 . INTAKE DOOR MOTOR ..................................... 43 .
LUBRICANT ............................................................ 18
. Mode Door ............................................................. 44
.
Maintenance of Lubricant Quantity in Compressor 18 ... TROUBLE DIAGNOSIS PROCEDURE FOR
LUBRICANT ....................................................... 18
. MODE DOOR ..................................................... 44 .
CHECKING AND ADJUSTING .......................... 18 . CONTROL LINKAGE ADJUSTMENT ................ 45 .
TROUBLE DIAGNOSIS ........................................... 21 . Air Mix Door ........................................................... 45
.
Component Layout ................................................ 21. TROUBLE DIAGNOSIS PROCEDURE FOR AIR
MTC-1
MIX DOOR ......................................................... 45 . COIL ....................................................................75
.
Temperature Control Linkage Adjustment ............. 47 . Installation ..............................................................75
.
BLOWER MOTOR ................................................... 48 . QG18DE .............................................................75 .
Trouble Diagnosis Procedure for Blower Motor ..... 48 . QR25DE ..............................................................77.
Blower Motor Circuit .............................................. 49 . Break-In Operation .................................................78 .
Electrical Components Inspection ......................... 53 . THERMAL PROTECTOR .........................................79 .
FAN CONTROL SWITCH ................................... 53 . Inspection ...............................................................79
.
BLOWER MOTOR .............................................. 53 . IN-CABIN MICROFILTER .........................................80 .
FAN RESISTOR ................................................. 53 . Removal and Installation ........................................80 .
MAGNET CLUTCH .................................................. 54 . FUNCTION .........................................................80 .
Trouble Diagnosis Procedure for Magnet Clutch ... 54 REPLACEMENT TIMING ...................................80 .
Magnet Clutch Circuit ............................................ 55 . REPLACEMENT PROCEDURES .......................80 .
Electrical Component Inspection ........................... 60 . HEATER & COOLING UNIT (HEATER CORE) .......81 .
A/C RELAY ......................................................... 60 . Removal .................................................................81
.
REFRIGERANT PRESSURE SENSOR ............. 61 . Installation ..............................................................81
.
THERMO CONTROL AMP. ................................ 61 . BLOWER UNIT .........................................................82 .
INSUFFICIENT COOLING ....................................... 62 . Removal .................................................................82
.
Trouble Diagnosis Procedure for Insufficient Cool- Installation ..............................................................82
.
ing .......................................................................... 62
. A/C EVAPORATOR ..................................................83 .
Performance Test Diagnoses ................................ 63 . Removal .................................................................83
.
Performance Chart ................................................ 65 . Installation ..............................................................84
.
TEST CONDITION ............................................. 65 . REFRIGERANT LINES ............................................85 .
TEST READING ................................................. 65 . HFC-134a (R-134a) Service Procedure .................85 .
Trouble Diagnoses for Abnormal Pressure ............ 66 . SETTING OF SERVICE TOOLS AND EQUIP-
BOTH HIGH AND LOW-PRESSURE SIDES ARE MENT ..................................................................85
.
TOO HIGH. ......................................................... 66 . Removal and Installation ........................................87 .
HIGH-PRESSURE SIDE IS TOO HIGH AND QG18DE .............................................................87 .
LOW-PRESSURE SIDE IS TOO LOW. .............. 66 . QR25DE ..............................................................89.
HIGH-PRESSURE SIDE IS TOO LOW AND Checking Refrigerant Leaks ...................................91 .
LOW-PRESSURE SIDE IS TOO HIGH. ............. 67 . PRELIMINARY CHECK ......................................91 .
BOTH HIGH- AND LOW-PRESSURE SIDES Electronic Refrigerant Leak Detector .....................91 .
ARE TOO LOW. ................................................. 67 . PRECAUTIONS FOR HANDLING LEAK
LOW-PRESSURE SIDE SOMETIMES DETECTOR ........................................................91 .
BECOMES NEGATIVE. ...................................... 68 . CHECKING PROCEDURE .................................92 .
LOW-PRESSURE SIDE BECOMES NEGATIVE. Fluorescent Dye Leak Detector .............................93 .
... 68 PRECAUTIONS FOR FLUORESCENT DYE
INSUFFICIENT HEATING ........................................ 69 . LEAK DETECTION .............................................93 .
Trouble Diagnosis Procedure for Insufficient Heat- CHECKING SYSTEM FOR LEAKS USING THE
ing .......................................................................... 69
. FLUORESCENT LEAK DETECTOR ..................93 .
NOISE ....................................................................... 70
. DYE INJECTION .................................................93 .
Trouble Diagnosis Procedure for Noise ................. 70 . BELT .........................................................................95
.
COMPRESSOR ........................................................ 71 . Tension Adjustment ................................................95 .
Removal and Installation ....................................... 71 . IDLE AIR CONTROL VALVE (IACV) -- AUXILIARY
COMPRESSOR CLUTCH ........................................ 72 . AIR CONTROL (AAC) VALVE .................................96 .
Overhaul ................................................................ 72
. Inspection ...............................................................96
.
QG18DE ............................................................. 72 . SERVICE DATA AND SPECIFICATIONS (SDS) .....97 .
QR25DE ............................................................. 72 . General Specifications ...........................................97 .
Removal ................................................................ 73. COMPRESSOR ..................................................97 .
QG18DE ............................................................. 73 . LUBRICANT ........................................................97 .
QR25DE ............................................................. 74 . REFRIGERANT ..................................................97 .
Inspection .............................................................. 75
. Inspection and Adjustment .....................................97 .
CLUTCH DISC ................................................... 75 . ENGINE IDLING SPEED (WHEN A/C IS ON) ....97 .
PULLEY .............................................................. 75 . BELT TENSION ..................................................97 .
MTC-2
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS000UW
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. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual. C
WARNING:
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. D
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. E
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 harness connec-
tors. F
Precautions for Working with HFC-134a (R-134a) EJS000UX
WARNING: G
q CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed and compressor failure is likely to occur. Refer to "CONTAMINATED REFRIGERANT"
below. To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refriger-
ant Recovery/Recycling Recharging equipment (ACR4) (J-39500-NI) and Refrigerant Identifier. H
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- I
lowing handling precautions must be observed:
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