Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Altima 2000-2005 Approved Nissan Altima 2003 MTC
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J AIR CONDITIONER
A
B
SECTION
MANUAL AIR CONDITIONER C
D
E
CONTENTS
PRECAUTIONS ......................................................... 3
. TEMPERATURE CONTROL DIAL ..................... 21 . F
Precautions for Supplemental Restraint System RECIRCULATION (REC) SWITCH .................... 21 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- AIR CONDITIONER (A/C) SWITCH ................... 21 .
SIONER" ................................................................. 3
. Discharge Air Flow ................................................ 22
. G
Precautions for Working with HFC-134a (R-134a) 3 ..... System Description ................................................ 23
.
Contaminated Refrigerant ....................................... 3 . SWITCHES AND THEIR CONTROL FUNCTION 23 ...
General Refrigerant Precautions ............................. 4 . CAN Communication System Description ............. 23 .
H
Precautions for Leak Detection Dye ........................ 4 . FOR TCS MODELS ........................................... 23 .
A/C Identification Label ........................................... 4
. FOR A/T MODELS ............................................. 25 .
Precautions for Refrigerant Connection .................. 5 . FOR M/T MODELS ............................................ 26 .
FEATURES OF NEW TYPE REFRIGERANT TROUBLE DIAGNOSIS ........................................... 28 . I
CONNECTION ..................................................... 5. How to Perform Trouble Diagnoses for Quick and
O-RING AND REFRIGERANT CONNECTION..... 6 Accurate Repair ..................................................... 28
.
Precautions for Servicing Compressor .................... 9 . WORK FLOW ..................................................... 28 . MTC
Precautions for Service Equipment ......................... 9 . SYMPTOM TABLE ............................................. 28 .
RECOVERY/RECYCLING EQUIPMENT ............. 9 . Component Parts and Harness Connector Location 29 ...
ELECTRONIC LEAK DETECTOR ....................... 9 . ENGINE COMPARTMENT ................................. 29 .
K
VACUUM PUMP ................................................ 10 . PASSENGER COMPARTMENT ........................ 31 .
MANIFOLD GAUGE SET ................................... 10 . Circuit Diagram ...................................................... 32
.
SERVICE HOSES .............................................. 10 . Wiring Diagram -- HEATER -- ............................. 33 .
SERVICE COUPLERS ........................................11 . Wiring Diagram -- A/C,M -- .................................. 35 . L
CHARGING CYLINDER ......................................11 . Operational Check ................................................. 38
.
Wiring Diagrams and Trouble Diagnosis ................11 . CONDITIONS: .................................................... 38.
PREPARATION ........................................................ 12
. PROCEDURE: ................................................... 38 . M
Special Service Tools ............................................ 12
. A/C System ............................................................ 40
.
HFC-134a (R-134a) Service Tools and Equipment 12 ... DIAGNOSTIC PROCEDURE ............................. 40 .
Commercial Service Tools ..................................... 15 . Mode Door Motor Circuit ....................................... 42 .
REFRIGERATION SYSTEM .................................... 16 . INSPECTION FLOW .......................................... 42 .
Refrigeration Cycle ................................................ 16
. SYSTEM DESCRIPTION ................................... 43 .
REFRIGERANT FLOW ...................................... 16 . DIAGNOSTIC PROCEDURE ............................. 43 .
REFRIGERANT SYSTEM PROTECTION ......... 16 . MODE DOOR ..................................................... 44 .
Component Layout ................................................ 17. Air Mix Door ........................................................... 45
.
LUBRICANT ............................................................ 18
. INSPECTION FLOW .......................................... 45 .
Maintenance of Lubricant Quantity in Compressor 18 ... CONTROL LINKAGE ADJUSTMENT ................ 45 .
LUBRICANT ....................................................... 18
. Intake Door Motor Circuit ....................................... 46 .
CHECKING AND ADJUSTING .......................... 18 . INSPECTION FLOW .......................................... 46 .
AIR CONDITIONER CONTROL .............................. 21 . SYSTEM DESCRIPTION ................................... 46 .
Control Operation .................................................. 21
. DIAGNOSTIC PROCEDURE ............................. 47 .
FAN CONTROL DIAL ........................................ 21 . CONTROL LINKAGE ADJUSTMENT ................ 48 .
AIR CONTROL DIAL .......................................... 21 . Blower Motor Circuit .............................................. 49
.
Revision: May 2004 MTC-1 2003 Altima
INSPECTION FLOW .......................................... 49 . REFRIGERANT LINES ............................................79 .
DIAGNOSTIC PROCEDURE ............................. 49 . HFC-134a (R-134a) Service Procedure .................79 .
ELECTRICAL COMPONENTS INSPECTION .... 53 . SETTING OF SERVICE TOOLS AND EQUIP-
Magnet Clutch Circuit ............................................ 54 . MENT ..................................................................79
.
INSPECTION FLOW .......................................... 54 . Components ...........................................................80 .
DIAGNOSTIC PROCEDURE ............................. 55 . Removal and Installation for Compressor --
REFRIGERANT PRESSURE SENSOR ............. 57 . QR25DE Models ....................................................83 .
Insufficient Cooling ................................................ 58 . REMOVAL ..........................................................83 .
INSPECTION FLOW .......................................... 58 . INSTALLATION ..................................................83 .
PERFORMANCE CHART .................................. 59 . Removal and Installation for Compressor --
TROUBLE DIAGNOSES FOR ABNORMAL VQ35DE Models ....................................................84 .
PRESSURE ........................................................ 59 . REMOVAL ..........................................................84 .
Insufficient Heating ................................................ 63 . INSTALLATION ..................................................84 .
INSPECTION FLOW .......................................... 63 . Removal and Installation for Compressor Clutch ...85
Noise ..................................................................... 64
. REMOVAL ...........................................................85 .
INSPECTION FLOW .......................................... 64 . INSPECTION ......................................................86 .
Intake Sensor Circuit ............................................. 65 . INSTALLATION ...................................................86 .
COMPONENT DESCRIPTION ........................... 65 . BREAK-IN OPERATION .....................................87 .
DIAGNOSTIC PROCEDURE ............................. 65 . Removal and Installation for Low-pressure Flexible
CONTROL UNIT ....................................................... 67 . Hose .......................................................................87
.
Removal and Installation ....................................... 67 . REMOVAL ..........................................................87 .
REMOVAL .......................................................... 67 . INSTALLATION ..................................................87 .
INSTALLATION ................................................... 67 . Removal and Installation for High-pressure flexible
INTAKE SENSOR .................................................... 68 . hose .......................................................................88
.
Removal and Installation ....................................... 68 . REMOVAL ..........................................................88 .
BLOWER UNIT ........................................................ 69 . INSTALLATION ..................................................88 .
Removal and Installation ....................................... 69 . Removal and Installation for High-pressure Pipe ...88
REMOVAL .......................................................... 69 . REMOVAL ..........................................................88 .
BLOWER MOTOR ................................................... 70 . INSTALLATION ..................................................88 .
Removal and Installation ....................................... 70 . Removal and Installation for Refrigerant Pressure
INTAKE DOOR MOTOR .......................................... 71 . Sensor ....................................................................88
.
Removal and Installation ....................................... 71 . Removal and Installation for Condenser ................88 .
IN-CABIN MICROFILTER ........................................ 72 . REMOVAL ..........................................................88 .
Removal and Installation ....................................... 72 . INSTALLATION ..................................................89 .
FUNCTION ......................................................... 72 . Removal and Installation for Liquid Tank ...............89 .
REPLACEMENT TIMING ................................... 72 . Removal and Installation for Evaporator ................90 .
REPLACEMENT PROCEDURES ...................... 72 . REMOVAL ...........................................................90 .
HEATER & COOLING UNIT ASSEMBLY ................ 73 . INSTALLATION ...................................................91 .
Removal and Installation ....................................... 73 . Removal and Installation for Expansion Valve .......91 .
REMOVAL .......................................................... 73 . REMOVAL ...........................................................91 .
INSTALLATION .................................................. 73 . INSTALLATION ...................................................91 .
HEATER CORE ........................................................ 74 . Checking for Refrigerant Leaks .............................91 .
Removal and Installation ....................................... 74 . Checking System for Leaks Using the Fluorescent
MODE DOOR MOTOR ............................................. 75 . Leak Detector .........................................................92.
Removal and Installation ....................................... 75 . Dye Injection ..........................................................92
.
DRIVER SIDE MODE DOOR MOTOR ............... 75 . Electronic Refrigerant Leak Detector .....................92 .
BLOWER FAN RESISTER ....................................... 76 . PRECAUTIONS FOR HANDLING LEAK
Removal and Installation ....................................... 76 . DETECTOR ........................................................92 .
DUCTS AND GRILLES ............................................ 77 . CHECKING PROCEDURE .................................93 .
Removal and Installation ....................................... 77 . SERVICE DATA AND SPECIFICATIONS (SDS) .....95 .
Ventilator Duct, Defroster Nozzle and Defroster Service Data and Specifications (SDS) .................95 .
Ducts ...................................................................... 77
. COMPRESSOR ..................................................95 .
Center Ventilator Grille .......................................... 77 . LUBRICANT ........................................................95 .
Side Ventilator Grille LH ........................................ 77 . REFRIGERANT ..................................................95 .
Side Ventilator Grille RH ........................................ 78 . ENGINE IDLING SPEED ....................................95 .
Floor duct ............................................................... 78
. BELT TENSION ..................................................95 .
Revision: May 2004 MTC-2 2003 Altima
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS001GB
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) EJS001ED
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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