Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Sentra 2000-2005 Approved Nissan Sentra 2004 MTC
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J AIR CONDITIONER
A
B
SECTION
MANUAL AIR CONDITIONER C
D
E
CONTENTS
PRECAUTIONS ......................................................... 3
. REAR WINDOW DEFOGGER SWITCH ............ 20 . F
Precautions for Supplemental Restraint System MODE CONTROL KNOB ................................... 20 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- TEMPERATURE CONTROL KNOB ................... 20 .
SIONER" ................................................................. 3
. RECIRCULATION (REC) SWITCH .................... 20 . G
Precautions for Working with HFC-134a (R-134a) 3 ..... AIR CONDITIONER (A/C) SWITCH ................... 20 .
Contaminated Refrigerant ....................................... 3 . Discharge Air Flow ................................................ 21
.
General Refrigerant Precautions ............................. 4 . System Description ................................................ 22
.
H
Precautions for Leak Detection Dye ........................ 4 . SWITCHES AND THEIR CONTROL FUNC-
A/C Identification Label ........................................... 4
. TIONS ................................................................ 22
.
Precautions for Refrigerant Connection .................. 5 . Component Location ............................................. 23 .
FEATURES OF NEW TYPE REFRIGERANT ENGINE COMPARTMENT ................................. 23 . I
CONNECTION ..................................................... 5. PASSENGER COMPARTMENT ........................ 24 .
O-RING AND REFRIGERANT CONNECTION..... 6 Wiring Diagram -- Heater -- ................................. 25 .
Precautions for Servicing Compressor .................... 8 . QG18DE MODELS ............................................. 25 . MTC
Precautions for Service Equipment ......................... 8 . Wiring Diagram -- A/C, M -- ................................. 27 .
RECOVERY/RECYCLING EQUIPMENT ............. 8 . QG18DE MODELS ............................................. 27 .
ELECTRONIC LEAK DETECTOR ....................... 8 . QR25DE MODELS ............................................. 31 .
K
VACUUM PUMP .................................................. 9 . How to Perform Trouble Diagnoses for Quick and
MANIFOLD GAUGE SET ..................................... 9 . Accurate Repair ..................................................... 34
.
SERVICE HOSES ................................................ 9 . WORK FLOW ..................................................... 34 .
SERVICE COUPLERS ....................................... 10 . SYMPTOM TABLE ............................................. 34 . L
CHARGING CYLINDER ..................................... 10 . Operational Check ................................................. 35
.
Wiring Diagrams and Trouble Diagnosis ............... 10 . CONDITIONS: .................................................... 35.
PREPARATION .........................................................11
. PROCEDURE: ................................................... 35 . M
Special Service Tools .............................................11
. Main Power Supply and Ground Circuit Check ..... 37 .
HFC-134a (R-134a) Service Tools and Equipment 12 ... POWER SUPPLY CIRCUIT CHECK .................. 37 .
COMMERCIAL SERVICE TOOL ....................... 14 . INTAKE DOOR ......................................................... 38
.
REFRIGERATION SYSTEM .................................... 15 . Trouble Diagnosis Procedure for Intake Door ....... 38 .
Refrigeration Cycle ................................................ 15
. Component Description ......................................... 38 .
REFRIGERANT FLOW ...................................... 15 . INTAKE DOOR MOTOR ..................................... 38 .
FREEZE PROTECTION .................................... 15 . Intake Door Motor Circuit ....................................... 39 .
REFRIGERANT SYSTEM PROTECTION ......... 15 . Control Linkage Adjustment .................................. 41 .
LUBRICANT ............................................................ 16
. INTAKE DOOR MOTOR ..................................... 41 .
Maintenance of Lubricant Quantity in Compressor 16 ... Mode Door ............................................................. 42
.
LUBRICANT ....................................................... 16
. TROUBLE DIAGNOSIS PROCEDURE FOR
CHECKING AND ADJUSTING .......................... 16 . MODE DOOR ..................................................... 42 .
TROUBLE DIAGNOSIS ........................................... 19 . CONTROL LINKAGE ADJUSTMENT ................ 43 .
Component Layout ................................................ 19. Air Mix Door ........................................................... 44
.
Control Operation .................................................. 20
. TROUBLE DIAGNOSIS PROCEDURE FOR AIR
FAN CONTROL SWITCH .................................. 20 .
MTC-1
MIX DOOR ......................................................... 44 . Inspection ...............................................................72
.
Temperature Control Linkage Adjustment ............. 45 . CLUTCH DISC ....................................................72 .
BLOWER MOTOR ................................................... 46 . PULLEY ..............................................................72.
Trouble Diagnosis Procedure for Blower Motor ..... 46 . COIL ....................................................................72
.
Blower Motor Circuit .............................................. 46 . Installation ..............................................................72
.
Electrical Components Inspection ......................... 50 . QG18DE .............................................................72 .
FAN CONTROL SWITCH ................................... 50 . QR25DE ..............................................................74.
BLOWER MOTOR .............................................. 50 . Break-In Operation .................................................75 .
FAN RESISTOR ................................................. 50 . THERMAL PROTECTOR .........................................76 .
MAGNET CLUTCH .................................................. 51 . Inspection ...............................................................76
.
Trouble Diagnosis Procedure for Magnet Clutch ... 51 IN-CABIN MICROFILTER .........................................77 .
Magnet Clutch Circuit ............................................ 52 . Removal and Installation ........................................77 .
Electrical Component Inspection ........................... 55 . FUNCTION .........................................................77 .
A/C RELAY ......................................................... 55 . REPLACEMENT TIMING ...................................77 .
REFRIGERANT PRESSURE SENSOR ............. 56 . REPLACEMENT PROCEDURES .......................77 .
INSUFFICIENT COOLING ....................................... 57 . HEATER & COOLING UNIT (HEATER CORE) .......78 .
Trouble Diagnosis Procedure for Insufficient Cool- Removal .................................................................78
.
ing .......................................................................... 57
. Installation ..............................................................78
.
Performance Test Diagnoses ................................ 58 . BLOWER UNIT .........................................................79 .
Performance Chart ................................................ 60 . Removal .................................................................79
.
TEST CONDITION ............................................. 60 . Installation ..............................................................79
.
TEST READING ................................................. 60 . A/C EVAPORATOR ..................................................80 .
Trouble Diagnoses for Abnormal Pressure ............ 61 . Removal .................................................................80
.
BOTH HIGH AND LOW-PRESSURE SIDES ARE Installation ..............................................................81
.
TOO HIGH. ......................................................... 61 . REFRIGERANT LINES ............................................82 .
HIGH-PRESSURE SIDE IS TOO HIGH AND HFC-134a (R-134a) Service Procedure .................82 .
LOW-PRESSURE SIDE IS TOO LOW. .............. 61 . SETTING OF SERVICE TOOLS AND EQUIP-
HIGH-PRESSURE SIDE IS TOO LOW AND MENT ..................................................................82
.
LOW-PRESSURE SIDE IS TOO HIGH. ............. 62 . Removal and Installation ........................................84 .
BOTH HIGH- AND LOW-PRESSURE SIDES QG18DE .............................................................84 .
ARE TOO LOW. ................................................. 62 . QR25DE ..............................................................85.
LOW-PRESSURE SIDE SOMETIMES Checking Refrigerant Leaks ...................................86 .
BECOMES NEGATIVE. ...................................... 63 . PRELIMINARY CHECK ......................................86 .
LOW-PRESSURE SIDE BECOMES NEGATIVE. Electronic Refrigerant Leak Detector .....................86 .
... 63 PRECAUTIONS FOR HANDLING LEAK
INSUFFICIENT HEATING ........................................ 64 . DETECTOR ........................................................86 .
Trouble Diagnosis Procedure for Insufficient Heat- CHECKING PROCEDURE .................................87 .
ing .......................................................................... 64
. Fluorescent Dye Leak Detector .............................88 .
NOISE ....................................................................... 65
. PRECAUTIONS FOR FLUORESCENT DYE
Trouble Diagnosis Procedure for Noise ................. 65 . LEAK DETECTION .............................................88 .
INTAKE SENSOR .................................................... 66 . CHECKING SYSTEM FOR LEAKS USING THE
Intake Sensor Circuit ............................................. 66 . FLUORESCENT LEAK DETECTOR ..................88 .
COMPONENT DESCRIPTION ........................... 66 . DYE INJECTION .................................................88 .
DIAGNOSTIC PROCEDURE ............................. 66 . BELT .........................................................................90
.
Removal and Installation ....................................... 67 . Tension Adjustment ................................................90 .
COMPRESSOR ........................................................ 68 . SERVICE DATA AND SPECIFICATIONS (SDS) .....91 .
Removal and Installation ....................................... 68 . General Specifications ...........................................91 .
COMPRESSOR CLUTCH ........................................ 69 . COMPRESSOR ..................................................91 .
Overhaul ................................................................ 69
. LUBRICANT ........................................................91 .
QG18DE ............................................................. 69 . REFRIGERANT ..................................................91 .
QR25DE ............................................................. 69 . Inspection and Adjustment .....................................91 .
Removal ................................................................ 70. ENGINE IDLING SPEED (WHEN A/C IS ON) ....91 .
QG18DE ............................................................. 70 . BELT TENSION ..................................................91 .
QR25DE ............................................................. 71 .
MTC-2
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS001QX
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 harnesses or
harness connectors. F
Precautions for Working with HFC-134a (R-134a) EJS001A7
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 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. 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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