Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Sentra 2000-2005 Approved Nissan Sentra 2005 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 . WITHOUT A/C .................................................... 25. MTC
Precautions for Service Equipment ......................... 8 . Wiring Diagram -- A/C, M -- ................................. 27 .
RECOVERY/RECYCLING EQUIPMENT ............. 8 . WITH A/C ........................................................... 27
.
ELECTRONIC LEAK DETECTOR ....................... 8 . How to Perform Trouble Diagnoses for Quick and
K
VACUUM PUMP .................................................. 9 . Accurate Repair ..................................................... 30
.
MANIFOLD GAUGE SET ..................................... 9 . WORK FLOW ..................................................... 30 .
SERVICE HOSES ................................................ 9 . SYMPTOM TABLE ............................................. 30 .
SERVICE COUPLERS ....................................... 10 . Operational Check ................................................. 31
. L
CHARGING CYLINDER ..................................... 10 . CONDITIONS: .................................................... 31.
Wiring Diagrams and Trouble Diagnosis ............... 10 . PROCEDURE: ................................................... 31 .
PREPARATION .........................................................11
. Main Power Supply and Ground Circuit Check ..... 33 . M
Special Service Tools .............................................11
. POWER SUPPLY CIRCUIT CHECK .................. 33 .
HFC-134a (R-134a) Service Tools and Equipment 12 ... INTAKE DOOR ......................................................... 34
.
COMMERCIAL SERVICE TOOL ....................... 14 . Trouble Diagnosis Procedure for Intake Door ....... 34 .
REFRIGERATION SYSTEM .................................... 15 . Component Description ......................................... 34 .
Refrigeration Cycle ................................................ 15
. INTAKE DOOR MOTOR ..................................... 34 .
REFRIGERANT FLOW ...................................... 15 . Intake Door Motor Circuit ....................................... 35 .
FREEZE PROTECTION .................................... 15 . Control Linkage Adjustment .................................. 37 .
REFRIGERANT SYSTEM PROTECTION ......... 15 . INTAKE DOOR MOTOR ..................................... 37 .
LUBRICANT ............................................................ 16
. Mode Door ............................................................. 38
.
Maintenance of Lubricant Quantity in Compressor 16 ... TROUBLE DIAGNOSIS PROCEDURE FOR
LUBRICANT ....................................................... 16
. MODE DOOR ..................................................... 38 .
CHECKING AND ADJUSTING .......................... 16 . CONTROL LINKAGE ADJUSTMENT ................ 39 .
TROUBLE DIAGNOSIS ........................................... 19 . Air Mix Door ........................................................... 40
.
Component Layout ................................................ 19. TROUBLE DIAGNOSIS PROCEDURE FOR AIR
Control Operation .................................................. 20
. MIX DOOR ......................................................... 40
.
FAN CONTROL SWITCH .................................. 20 . Temperature Control Linkage Adjustment ............. 41 .
Revision: July 2005 MTC-1 2005 Sentra
BLOWER MOTOR ................................................... 42 . CLUTCH DISC ....................................................68 .
Trouble Diagnosis Procedure for Blower Motor ..... 42 . PULLEY ..............................................................68.
Blower Motor Circuit .............................................. 42 . COIL ....................................................................68
.
Electrical Components Inspection ......................... 46 . Installation ..............................................................68
.
FAN CONTROL SWITCH ................................... 46 . QG18DE .............................................................68 .
BLOWER MOTOR .............................................. 46 . QR25DE ..............................................................70.
FAN RESISTOR ................................................. 46 . Break-In Operation .................................................71 .
MAGNET CLUTCH .................................................. 47 . THERMAL PROTECTOR .........................................72 .
Trouble Diagnosis Procedure for Magnet Clutch ... 47 Inspection ...............................................................72
.
Magnet Clutch Circuit ............................................ 48 . IN-CABIN MICROFILTER .........................................73 .
Electrical Component Inspection ........................... 51 . Removal and Installation ........................................73 .
A/C RELAY ......................................................... 51 . FUNCTION .........................................................73 .
REFRIGERANT PRESSURE SENSOR ............. 52 . REPLACEMENT TIMING ...................................73 .
INSUFFICIENT COOLING ....................................... 53 . REPLACEMENT PROCEDURES .......................73 .
Trouble Diagnosis Procedure for Insufficient Cool- HEATER & COOLING UNIT (HEATER CORE) .......74 .
ing .......................................................................... 53
. Removal .................................................................74
.
Performance Test Diagnoses ................................ 54 . Installation ..............................................................74
.
Performance Chart ................................................ 56 . BLOWER UNIT .........................................................75 .
TEST CONDITION ............................................. 56 . Removal .................................................................75
.
TEST READING ................................................. 56 . Installation ..............................................................75
.
Trouble Diagnoses for Abnormal Pressure ............ 57 . A/C EVAPORATOR ..................................................76 .
BOTH HIGH AND LOW-PRESSURE SIDES ARE Removal .................................................................76
.
TOO HIGH. ......................................................... 57 . Installation ..............................................................77
.
HIGH-PRESSURE SIDE IS TOO HIGH AND REFRIGERANT LINES ............................................78 .
LOW-PRESSURE SIDE IS TOO LOW. .............. 57 . HFC-134a (R-134a) Service Procedure .................78 .
HIGH-PRESSURE SIDE IS TOO LOW AND SETTING OF SERVICE TOOLS AND EQUIP-
LOW-PRESSURE SIDE IS TOO HIGH. ............. 58 . MENT ..................................................................78
.
BOTH HIGH- AND LOW-PRESSURE SIDES Removal and Installation ........................................80 .
ARE TOO LOW. ................................................. 58 . QG18DE .............................................................80 .
LOW-PRESSURE SIDE SOMETIMES QR25DE ..............................................................81.
BECOMES NEGATIVE. ...................................... 59 . Checking Refrigerant Leaks ...................................82 .
LOW-PRESSURE SIDE BECOMES NEGATIVE. PRELIMINARY CHECK ......................................82 .
... 59 Electronic Refrigerant Leak Detector .....................82 .
INSUFFICIENT HEATING ........................................ 60 . PRECAUTIONS FOR HANDLING LEAK
Trouble Diagnosis Procedure for Insufficient Heat- DETECTOR ........................................................82 .
ing .......................................................................... 60
. CHECKING PROCEDURE .................................83 .
NOISE ....................................................................... 61
. Fluorescent Dye Leak Detector .............................84 .
Trouble Diagnosis Procedure for Noise ................. 61 . PRECAUTIONS FOR FLUORESCENT DYE
INTAKE SENSOR .................................................... 62 . LEAK DETECTION .............................................84 .
Intake Sensor Circuit ............................................. 62 . CHECKING SYSTEM FOR LEAKS USING THE
COMPONENT DESCRIPTION ........................... 62 . FLUORESCENT LEAK DETECTOR ..................84 .
DIAGNOSTIC PROCEDURE ............................. 62 . DYE INJECTION .................................................84 .
Removal and Installation ....................................... 63 . BELT .........................................................................86
.
COMPRESSOR ........................................................ 64 . Tension Adjustment ................................................86 .
Removal and Installation ....................................... 64 . SERVICE DATA AND SPECIFICATIONS (SDS) .....87 .
COMPRESSOR CLUTCH ........................................ 65 . General Specifications ...........................................87 .
Overhaul ................................................................ 65
. COMPRESSOR ..................................................87 .
QG18DE ............................................................. 65 . LUBRICANT ........................................................87 .
QR25DE ............................................................. 65 . REFRIGERANT ..................................................87 .
Removal ................................................................ 66. Inspection and Adjustment .....................................87 .
QG18DE ............................................................. 66 . ENGINE IDLING SPEED (WHEN A/C IS ON) ....87 .
QR25DE ............................................................. 67 . BELT TENSION ..................................................87 .
Inspection .............................................................. 68
.
Revision: July 2005 MTC-2 2005 Sentra
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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