Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Sentra 2006-2009 Approved Nissan Sentra 2007 MTC
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J AIR CONDITIONER
A
SECTION
MANUAL AIR CONDITIONER
MTC B
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 4 . System Construction ............................................. 24
. F
Precautions for Supplemental Restraint System OPERATION ...................................................... 24
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- TRANSMISSION DATA AND TRANSMISSION
SIONER" ................................................................. 4. ORDER .............................................................. 25
. G
Precautions for Working with HFC-134a (R-134a) 4 ..... AIR MIX DOOR CONTROL ................................ 25 .
Contaminated Refrigerant ....................................... 4 . BLOWER SPEED CONTROL ............................ 26 .
General Refrigerant Precautions ............................. 5 . INTAKE DOOR CONTROL ................................ 26 .
H
Precautions for Leak Detection Dye ........................ 5 . MODE DOOR CONTROL .................................. 26 .
A/C Identification Label ........................................... 5 . MAGNET CLUTCH CONTROL .......................... 26 .
Precautions for Refrigerant Connection .................. 5 . Overview of Control system ................................... 26 .
FEATURES OF NEW TYPE REFRIGERANT Control Operation .................................................. 27
. I
CONNECTION ..................................................... 6 . AIR CONDITIONER (A/C) SWITCH ................... 28 .
O-RING AND REFRIGERANT CONNECTION ..... 7 TEMPERATURE DIAL (POTENTIO TEMPERA-
Precautions for Servicing Compressor ...................11 . TURE CONTROL) .............................................. 28 . MTC
Precautions for Service Equipment ........................11 . BLOWER CONTROL DIAL/OFF SWITCH ......... 28 .
RECOVERY/RECYCLING EQUIPMENT ............11 . RECIRCULATION () SWITCH ............................ 28 .
ELECTRONIC LEAK DETECTOR ......................11 . DEFROSTER SWITCH ...................................... 28 .
K
VACUUM PUMP ................................................ 12 . MODE DIAL ........................................................ 28
.
MANIFOLD GAUGE SET ................................... 12 . REAR WINDOW DEFOGGER SWITCH ............ 28 .
SERVICE HOSES .............................................. 12 . Discharge Air Flow ................................................ 29
.
SERVICE COUPLERS ....................................... 13 . System Description ................................................ 30
. L
REFRIGERANT WEIGHT SCALE ..................... 13 . SWITCHES AND THEIR CONTROL FUNCTION 30 ...
CHARGING CYLINDER ..................................... 13 . CAN Communication System Description ............. 30 .
PREPARATION ........................................................ 14 . TROUBLE DIAGNOSIS ........................................... 31 . M
Special Service Tools ............................................ 14 . How to Perform Trouble Diagnoses for Quick and
HFC-134a (R-134a) Service Tools and Equipment 14 ... Accurate Repair ..................................................... 31
.
Commercial Service Tools ..................................... 17 . WORK FLOW ..................................................... 31
.
REFRIGERATION SYSTEM .................................... 18 . SYMPTOM TABLE ............................................. 31 .
Refrigerant Cycle .................................................. 18 . Component Parts and Harness Connector Location 32 ...
REFRIGERANT FLOW ...................................... 18 . ENGINE COMPARTMENT - QR25DE ............... 32 .
Refrigerant System Protection .............................. 18 . ENGINE COMPARTMENT - MR20DE ............... 33 .
REFRIGERANT PRESSURE SENSOR ............ 18 . PASSENGER COMPARTMENT ........................ 34 .
PRESSURE RELIEF VALVE .............................. 18 . Circuit Diagram ...................................................... 35
.
Component Layout ................................................ 19 . Wiring Diagram -- HEATER -- ............................. 36 .
OIL ........................................................................... 21
. Wiring Diagram -- A/C,M -- .................................. 38 .
Maintenance of Oil Quantity in Compressor ......... 21 . Front Air Control Terminals and Reference Values 41 ...
OIL ..................................................................... 21
. INSPECTION OF FRONT AIR CONTROL ......... 41 .
CHECKING AND ADJUSTING .......................... 21 . FRONT AIR CONTROL HARNESS CONNEC-
AIR CONDITIONER CONTROL .............................. 24 . TOR TERMINAL LAYOUT .................................. 41 .
Overview Air Conditioner LAN Control System ..... 24 . TERMINAL AND REFERENCE VALUES FOR
Revision: December 2006 MTC-1 2007 Sentra
FRONT AIR CONTROL ...................................... 41 . IN-CABIN MICROFILTER .........................................79 .
Operational Check ................................................. 43 . Removal and Installation ........................................79 .
CHECKING BLOWER ........................................ 43 . FUNCTION .........................................................79.
CHECKING DISCHARGE AIR ........................... 43 . REPLACEMENT TIMING ...................................79 .
CHECKING RECIRCULATION ........................... 43 . REPLACEMENT PROCEDURES .......................79 .
CHECKING TEMPERATURE DECREASE ........ 43 . HEATER & COOLING UNIT ASSEMBLY ................81 .
CHECKING TEMPERATURE INCREASE ......... 43 . Removal and Installation ........................................81 .
CHECKING A/C SWITCH (IF EQUIPPED) ........ 43 . REMOVAL ...........................................................81
.
Power Supply and Ground Circuit for Front Air Con- INSTALLATION ...................................................82 .
trol .......................................................................... 44
. HEATER CORE ........................................................83 .
INSPECTION FLOW .......................................... 44 . Removal and Installation ........................................83 .
COMPONENT DESCRIPTION ........................... 45 . REMOVAL ...........................................................83
.
DIAGNOSTIC PROCEDURE ............................. 45 . INSTALLATION ...................................................83 .
LAN System Circuit ............................................... 47 . INTAKE DOOR MOTOR ...........................................84 .
DIAGNOSTIC PROCEDURE ............................. 47 . Removal and Installation ........................................84 .
Mode Door Motor Circuit ....................................... 50 . REMOVAL ...........................................................84
.
INSPECTION FLOW .......................................... 50 . INSTALLATION ...................................................84 .
SYSTEM DESCRIPTION ................................... 51 . MODE DOOR MOTOR .............................................85 .
COMPONENT DESCRIPTION ........................... 51 . Removal and Installation ........................................85 .
DIAGNOSTIC PROCEDURE ............................. 51 . REMOVAL ...........................................................85
.
Air Mix Door Motor Circuit ..................................... 52 . INSTALLATION ...................................................85 .
INSPECTION FLOW .......................................... 52 . AIR MIX DOOR MOTOR ..........................................86 .
SYSTEM DESCRIPTION ................................... 53 . Removal and Installation ........................................86 .
COMPONENT DESCRIPTION ........................... 53 . REMOVAL ...........................................................86
.
DIAGNOSTIC PROCEDURE ............................. 53 . INSTALLATION ...................................................86 .
Intake Door Motor Circuit ....................................... 54 . FAN CONTROL AMPLIFIER ....................................87 .
INSPECTION FLOW .......................................... 54 . Removal and Installation ........................................87 .
SYSTEM DESCRIPTION ................................... 55 . REMOVAL ...........................................................87
.
COMPONENT DESCRIPTION ........................... 55 . INSTALLATION ...................................................87 .
DIAGNOSTIC PROCEDURE ............................. 55 . DUCTS AND GRILLES ............................................88 .
Blower Motor Circuit .............................................. 56 . Removal and Installation ........................................88 .
INSPECTION FLOW .......................................... 56 . CENTER VENTILATOR GRILLE RH, LH ...........89 .
SYSTEM DESCRIPTION ................................... 57 . UPPER DEFROSTER GRILLE ...........................89 .
COMPONENT DESCRIPTION ........................... 57 . SIDE VENTILATOR GRILLE RH, LH ..................90 .
DIAGNOSTIC PROCEDURE ............................. 58 . SIDE DEFROSTER GRILLE RH, LH ..................90 .
COMPONENT INSPECTION ............................. 61 . SIDE VENTILATOR DUCT RH, LH ....................90 .
Magnet Clutch Circuit ............................................ 62 . DEFROSTER NOZZLE .......................................90 .
INSPECTION FLOW .......................................... 62 . SIDE DEFROSTER DUCT RH, LH .....................90 .
SYSTEM DESCRIPTION ................................... 63 . FRONT FOOT DUCT RH ...................................90 .
DIAGNOSTIC PROCEDURE ............................. 63 . FRONT FOOT DUCT LH ....................................90 .
Insufficient Cooling ................................................ 66 . REAR FLOOR CONNECTOR DUCT .................90 .
INSPECTION FLOW .......................................... 66 . REAR FLOOR DUCT RH ...................................91 .
PERFORMANCE TEST ANALYSIS ................... 68 . REAR FLOOR DUCT LH ....................................91 .
PERFORMANCE CHART .................................. 70 . REFRIGERANT LINES ............................................92 .
TROUBLE DIAGNOSIS FOR ABNORMAL HFC-134a (R-134a) Service Procedure .................92 .
PRESSURE ........................................................ 70 . SETTING OF SERVICE TOOLS AND EQUIP-
Insufficient Heating ................................................ 74 . MENT ..................................................................92
.
INSPECTION FLOW .......................................... 74 . Components ...........................................................94
.
Noise ..................................................................... 76
. Removal and Installation for Compressor -
INSPECTION FLOW .......................................... 76 . MR20DE ................................................................97
.
CONTROL UNIT ....................................................... 77 . REMOVAL ...........................................................97
.
Removal and Installation ....................................... 77 . INSTALLATION ...................................................97 .
FRONT AIR CONTROL ...................................... 77 . Removal and Installation for Compressor --
FRONT BLOWER MOTOR ...................................... 78 . QR25DE .................................................................98
.
Removal and Installation ....................................... 78 . REMOVAL ...........................................................98
.
REMOVAL .......................................................... 78 . INSTALLATION ...................................................98 .
INSTALLATION ................................................... 78 . Removal and Installation for Compressor Clutch -
MR20DE ................................................................99
.
REMOVAL ...........................................................99
.
Revision: December 2006 MTC-2 2007 Sentra
INSPECTION AFTER REMOVAL .................... 100 . INSTALLATION ................................................ 105 .
INSTALLATION ................................................ 100 . Removal and Installation for Condenser ............. 105 . A
INSPECTION AFTER INSTALLATION ............ 101 . REMOVAL ........................................................ 105 .
BREAK-IN OPERATION .................................. 101 . INSTALLATION ................................................ 106 .
Removal and Installation for Compressor Clutch - Removal and Installation for Evaporator ............. 106 . B
QR25DE .............................................................. 101
. REMOVAL ........................................................ 106 .
REMOVAL ........................................................ 101 . INSTALLATION ................................................ 107 .
INSPECTION AFTER REMOVAL .................... 102 . Removal and Installation for Expansion Valve ..... 107 .
INSTALLATION ................................................ 103 . REMOVAL ........................................................ 107 . C
INSPECTION AFTER INSTALLATION ............ 104 . INSTALLATION ................................................ 107 .
BREAK-IN OPERATION .................................. 104 . Checking for Refrigerant Leaks ........................... 107 .
Removal and Installation for Low-pressure Flexible Checking System for Leaks Using the Fluorescent D
Hose and Muffler Pipe ......................................... 104 . Leak Detector ...................................................... 108 .
REMOVAL ........................................................ 104 . Dye Injection ........................................................ 108
.
INSTALLATION ................................................ 104 . Electronic Refrigerant Leak Detector ................... 108 . E
Removal and Installation for High-pressure Flexible PRECAUTIONS FOR HANDLING THE LEAK
Hose .................................................................... 104
. DETECTOR ...................................................... 108 .
REMOVAL ........................................................ 104 . CHECKING PROCEDURE .............................. 109 .
INSTALLATION ................................................ 105 . SERVICE DATA AND SPECIFICATIONS (SDS) ....111 . F
Removal and Installation for High-pressure Pipe . 105 Service Data and Specifications (SDS) ................111 .
REMOVAL ........................................................ 105 . COMPRESSOR ................................................111 .
INSTALLATION ................................................ 105 . OIL .....................................................................111
. G
Removal and Installation for Refrigerant Pressure REFRIGERANT .................................................111 .
Sensor ................................................................. 105
. ENGINE IDLING SPEED ..................................111 .
REMOVAL ........................................................ 105 . BELT TENSION .................................................111 . H
I
MTC
K
L
M
Revision: December 2006 MTC-3 2007 Sentra
PRECAUTIONS
PRECAUTIONS PFP:00001
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS005O4
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
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
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:
G 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.
G 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.
G 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.
Precautions for Working with HFC-134a (R-134a) EJS005O5
WARNING:
G CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed compressor failure is likely to occur. Refer to MTC-4, "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.
G Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components.
If oil other than that specified is used, compressor failure is likely to occur.
G The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following
handling precautions must be observed:
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