Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Quest 2004-2009 Approved Nissan Quest 2007 MTC
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J AIR CONDITIONER
A
SECTION
MANUAL AIR CONDITIONER
MTC B
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 5 . AIR CONDITIONER CONTROL .............................. 25 . F
Precautions for Supplemental Restraint System Description ............................................................. 25
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Operation ............................................................... 25
.
SIONER" ................................................................. 5. AIR MIX DOOR CONTROL ................................ 25 . G
Precautions for Working with HFC-134a (R-134a) 5 ..... BLOWER SPEED CONTROL ............................ 25 .
Contaminated Refrigerant ....................................... 5 . INTAKE DOORS CONTROL .............................. 25 .
General Refrigerant Precautions ............................. 6 . MODE DOOR CONTROL .................................. 25 .
H
Precautions for Leak Detection Dye ........................ 6 . DEFROSTER DOOR CONTROL ....................... 25 .
A/C Identification Label ........................................... 6 . MAGNET CLUTCH CONTROL .......................... 26 .
Precautions for Refrigerant Connection .................. 6 . SELF-DIAGNOSTIC SYSTEM ........................... 26 .
FEATURES OF NEW TYPE REFRIGERANT Description of Control System ............................... 27 . I
CONNECTION ..................................................... 7 . Control Operation .................................................. 27
.
O-RING AND REFRIGERANT CONNECTION ..... 8 TEMPERATURE CONTROL DIAL (FRONT) ..... 28 .
Precautions for Servicing Compressor ...................11 . TEMPERATURE CONTROL DIAL (REAR) ........ 28 . MTC
Precautions for Service Equipment ........................11 . RECIRCULATION () SWITCH ............................ 28 .
RECOVERY/RECYCLING EQUIPMENT ............11 . REAR WINDOW DEFOGGER SWITCH ............ 28 .
ELECTRONIC LEAK DETECTOR ......................11 . OFF SWITCH ..................................................... 28 .
K
VACUUM PUMP ................................................ 12 . A/C SWITCH ...................................................... 28.
MANIFOLD GAUGE SET ................................... 12 . MODE SWITCHS (FRONT) ............................... 28 .
SERVICE HOSES .............................................. 12 . MODE DIAL (REAR) .......................................... 28 .
SERVICE COUPLERS ....................................... 13 . FRONT BLOWER CONTROL DIAL ................... 28 . L
REFRIGERANT WEIGHT SCALE ..................... 13 . REAR BLOWER CONTROL DIAL (FRONT) ...... 28 .
CHARGING CYLINDER ..................................... 13 . REAR BLOWER CONTROL DIAL (REAR) ........ 28 .
PREPARATION ........................................................ 14 . Discharge Air Flow ................................................ 29. M
Special Service Tools ............................................ 14 . FRONT ............................................................... 29
.
HFC-134a (R-134a) Service Tools and Equipment 14 ... REAR ................................................................. 29
.
Commercial Service Tools ..................................... 17 . System Description ................................................ 30.
REFRIGERATION SYSTEM .................................... 18 . SWITCHES AND THEIR CONTROL FUNCTION 30 ...
Refrigerant Cycle .................................................. 18 . CAN Communication System Description ............. 31 .
REFRIGERANT FLOW ...................................... 18 . TROUBLE DIAGNOSIS ........................................... 32 .
Refrigerant System Protection .............................. 18 . CONSULT-II Function (HVAC) ............................... 32 .
REFRIGERANT PRESSURE SENSOR ............ 18 . CONSULT-II START PROCEDURE ................... 32 .
PRESSURE RELIEF VALVE ............................. 19 . SELF-DIAGNOSIS ............................................. 32 .
Component Layout ................................................ 20 . DATA MONITOR ................................................ 33 .
FRONT REFRIGERATION SYSTEM ................. 20 . CONSULT-II Function (BCM) ................................ 34 .
REAR REFRIGERATION SYSTEM ................... 21 . CONSULT-II START PROCEDURE ................... 34 .
OIL ........................................................................... 22
. DATA MONITOR ................................................ 34 .
Maintenance of Oil Quantity in Compressor ......... 22 . How to Perform Trouble Diagnosis for Quick and
OIL ..................................................................... 22
. Accurate Repair ..................................................... 35
.
CHECKING AND ADJUSTING .......................... 22 . WORK FLOW ..................................................... 35 .
Revision: March 2006 MTC-1 2007 Quest
SYMPTOM TABLE ............................................. 35 . COMPONENT DESCRIPTION ...........................83 .
Component Parts and Harness Connector Location 37 ... DIAGNOSTIC PROCEDURE FOR
ENGINE COMPARTMENT ................................. 37 . DEFROSTER DOOR MOTOR ............................83 .
FRONT PASSENGER COMPARTMENT ........... 38 . Front Blower Motor Circuit .....................................85 .
REAR PASSENGER COMPARTMENT .............. 39 . INSPECTION FLOW ...........................................85 .
Schematic .............................................................. 40 . SYSTEM DESCRIPTION ....................................86 .
Wiring Diagram -- A/C,M -- .................................. 41 . COMPONENT DESCRIPTION ...........................86 .
Front Air Control Terminals and Reference Value... 49 DIAGNOSTIC PROCEDURE FOR BLOWER
FRONT AIR CONTROL HARNESS CONNEC- MOTOR ...............................................................87.
TOR TERMINAL LAYOUT .................................. 49 . COMPONENT INSPECTION ..............................92 .
TERMINALS AND REFERENCE VALUES FOR Rear Blower Motor Circuit ......................................93 .
FRONT AIR CONTROL ...................................... 49 . INSPECTION FLOW ...........................................93 .
A/C System Self-diagnosis Function ..................... 51 . SYSTEM DESCRIPTION ....................................95 .
DESCRIPTION ................................................... 51 . COMPONENT DESCRIPTION ...........................95 .
Operational Check (Front) ..................................... 53 . TROUBLE DIAGNOSIS PROCEDURE 1 ...........96 .
CHECKING BLOWER ........................................ 53 . TROUBLE DIAGNOSIS PROCEDURE 2 ...........97 .
CHECKING DISCHARGE AIR ........................... 53 . TROUBLE DIAGNOSIS PROCEDURE 3 ...........99 .
CHECKING RECIRCULATION ........................... 53 . TROUBLE DIAGNOSIS PROCEDURE 4 ......... 104 .
CHECKING TEMPERATURE DECREASE ........ 53 . COMPONENT INSPECTION ............................ 106 .
CHECKING TEMPERATURE INCREASE ......... 53 . Rear Temperature Control Circuit ........................ 107 .
CHECK A/C SWITCH ......................................... 53 . INSPECTION FLOW ......................................... 107 .
Operational Check (Rear) ...................................... 55 . SYSTEM DESCRIPTION .................................. 109 .
CHECKING REAR BLOWER MOTOR ............... 55 . DIAGNOSTIC PROCEDURE FOR REAR AIR
CHECKING REAR DISCHARGE AIR ................ 55 . CONTROL (FRONT) ......................................... 109 .
CHECKING REAR TEMPERATURE DIAGNOSTIC PROCEDURE FOR REAR AIR
DECREASE ........................................................ 55 . CONTROL (REAR) ........................................... 112 .
CHECKING REAR TEMPERATURE INCREASE 56 ... Magnet Clutch Circuit ........................................... 114 .
Power Supply and Ground Circuit for Front Air Con- INSPECTION FLOW ......................................... 114 .
trol .......................................................................... 57
. SYSTEM DESCRIPTION .................................. 115 .
INSPECTION FLOW .......................................... 57 . DIAGNOSTIC PROCEDURE FOR MAGNET
COMPONENT DESCRIPTION ........................... 58 . CLUTCH ........................................................... 115 .
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM 58 ... Insufficient Cooling ............................................... 120 .
Mode Door Motor Circuit ....................................... 60 . INSPECTION FLOW ......................................... 120 .
INSPECTION FLOW .......................................... 60 . PERFORMANCE TEST DIAGNOSES ............. 122 .
SYSTEM DESCRIPTION ................................... 61 . PERFORMANCE CHART ................................. 125 .
COMPONENT DESCRIPTION ........................... 61 . TROUBLE DIAGNOSES FOR UNUSUAL PRES-
DIAGNOSTIC PROCEDURE FOR MODE SURE ................................................................ 126
.
DOOR MOTOR .................................................. 62 . Insufficient Heating .............................................. 129 .
Air Mix Door Motor Circuit ..................................... 66 . INSPECTION FLOW ......................................... 129 .
INSPECTION FLOW .......................................... 66 . Heater Pump Circuit ............................................. 131 .
SYSTEM DESCRIPTION ................................... 68 . SYSTEM DESCRIPTION .................................. 131 .
............................................................................ 68
. DIAGNOSTIC PROCEDURE FOR HEATER
COMPONENT DESCRIPTION ........................... 68 . PUMP CIRCUIT ................................................ 132 .
DIAGNOSTIC PROCEDURE FOR AIR MIX COMPONENT INSPECTION ............................ 133 .
DOOR MOTOR (FRONT) ................................... 69 . Noise .................................................................... 134
.
DIAGNOSTIC PROCEDURE FOR AIR MIX INSPECTION FLOW ......................................... 134 .
DOOR MOTOR (REAR) ..................................... 72 . Self-diagnosis ...................................................... 135.
Intake Door Motor Circuit ....................................... 77 . INSPECTION FLOW ......................................... 135 .
INSPECTION FLOW .......................................... 77 . Ambient Sensor Circuit ........................................ 137 .
SYSTEM DESCRIPTION ................................... 78 . COMPONENT DESCRIPTION ......................... 137 .
COMPONENT DESCRIPTION ........................... 78 . AMBIENT TEMPERATURE INPUT PROCESS .137
DIAGNOSTIC PROCEDURE FOR INTAKE DIAGNOSTIC PROCEDURE FOR AMBIENT
DOOR MOTOR (DRIVER) .................................. 78 . SENSOR ........................................................... 137 .
DIAGNOSTIC PROCEDURE FOR INTAKE COMPONENT INSPECTION ............................ 139 .
DOOR MOTOR (PASSENGER) ......................... 80 . Intake Sensor Circuit ............................................ 139 .
Defroster Door Motor Circuit .................................. 82 . COMPONENT DESCRIPTION ......................... 139 .
SYMPTOM: ......................................................... 82 . DIAGNOSTIC PROCEDURE FOR INTAKE SEN-
INSPECTION FLOW .......................................... 82 . SOR .................................................................. 139
.
SYSTEM DESCRIPTION ................................... 83 . COMPONENT INSPECTION ............................ 141 .
Revision: March 2006 MTC-2 2007 Quest
CONTROL UNIT .................................................... 142 . Components ........................................................ 164 .
Removal and Installation ..................................... 142 . Removal and Installation ..................................... 165 . A
FRONT AIR CONTROL ................................... 142 . VARIABLE BLOWER CONTROL (FRONT) ..... 165 .
REAR AIR CONTROL (FRONT) ...................... 142 . VARIABLE BLOWER CONTROL (REAR) ........ 165 .
REAR AIR CONTROL (REAR) ........................ 142 . DUCTS AND GRILLES .......................................... 166 . B
AMBIENT SENSOR ............................................... 144 . Components ........................................................ 166 .
Removal and Installation ..................................... 144 . Removal and Installation ..................................... 169 .
REMOVAL ........................................................ 144 . DEFROSTER NOZZLE .................................... 169 .
INSTALLATION ................................................ 144 . FRESH AIR DUCT ........................................... 169 . C
INTAKE SENSOR .................................................. 145 . DEFROSTER DUCT ........................................ 169 .
Removal and Installation ..................................... 145 . RH AND LH SIDE DEMISTER DUCT .............. 169 .
REMOVAL ........................................................ 145 . RH, LH, AND CENTER VENTILATOR DUCT .. 169 . D
INSTALLATION ................................................ 145 . FLOOR CONNECTOR DUCT .......................... 169 .
BLOWER MOTOR ................................................. 146 . FLOOR DISTRIBUTION DUCT ........................ 170 .
Components ........................................................ 146. FLOOR JUNCTION DUCT ............................... 170 . E
Removal and Installation ..................................... 147 . FLOOR JUNCTION DUCT EXTENSION ......... 170 .
FRONT BLOWER MOTOR .............................. 147 . FLOOR DUCT .................................................. 170 .
REAR BLOWER MOTOR ................................ 147 . REAR OVERHEAD DUCT ............................... 170 .
IN-CABIN MICROFILTER ...................................... 148 . REAR FLOOR DUCT ....................................... 170 . F
Removal and Installation ..................................... 148 . GRILLES .......................................................... 170 .
FUNCTION ....................................................... 148 . REFRIGERANT LINES .......................................... 172 .
REPLACEMENT TIMING ................................. 148 . HFC-134a (R-134a) Service Procedure .............. 172 . G
REPLACEMENT PROCEDURES .................... 148 . SETTING OF SERVICE TOOLS AND EQUIP-
HEATER & COOLING UNIT ASSEMBLY ............. 149 . MENT ............................................................... 172
.
Components ........................................................ 149. Components ........................................................ 174 . H
Removal and Installation ..................................... 150 . Removal and Installation for Compressor ........... 176 .
FRONT HEATER AND COOLING UNIT ASSEM- REMOVAL ........................................................ 176 .
BLY ................................................................... 150
. INSTALLATION ................................................ 176 .
I
REAR HEATER AND COOLING UNIT ASSEM- Removal and Installation for Compressor Clutch . 177
BLY ................................................................... 151
. REMOVAL ........................................................ 177 .
HEATER CORE ..................................................... 152 . INSPECTION ................................................... 178 .
Components ........................................................ 152. INSTALLATION ................................................ 178 . MTC
Removal and Installation ..................................... 153 . BREAK-IN OPERATION ................................... 180 .
FRONT HEATER CORE .................................. 153 . Removal and Installation for Low-pressure Flexible
REAR HEATER CORE .................................... 154 . Hose .................................................................... 180
. K
HEATER PUMP ..................................................... 155 . REMOVAL ........................................................ 180 .
Removal and Installation ..................................... 155 . INSTALLATION ................................................ 180 .
REMOVAL ........................................................ 155 . Removal and Installation for High-pressure Flexible
L
INSTALLATION ................................................ 155 . Hose .................................................................... 180
.
DEFROSTER DOOR MOTOR ............................... 156 . REMOVAL ........................................................ 180 .
Removal and Installation ..................................... 156 . INSTALLATION ................................................ 180 .
REMOVAL ........................................................ 156 . Removal and Installation for High-pressure Pipe . 180 M
INSTALLATION ................................................ 156 . REMOVAL ........................................................ 180 .
INTAKE DOOR MOTOR ........................................ 157 . INSTALLATION ................................................ 180 .
Components ........................................................ 157. Removal and Installation for High/Low-pressure
Removal and Installation ..................................... 158 . Pipe ..................................................................... 181
.
DRIVER SIDE .................................................. 158 . REMOVAL ........................................................ 181 .
PASSENGER SIDE .......................................... 159 . INSTALLATION ................................................ 183 .
MODE DOOR MOTOR .......................................... 160 . Removal and Installation for Refrigerant Pressure
Removal and Installation ..................................... 160 . Sensor ................................................................. 184
.
REMOVAL ........................................................ 160 . REMOVAL ........................................................ 184 .
INSTALLATION ................................................ 161 . INSTALLATION ................................................ 185 .
AIR MIX DOOR MOTOR ........................................ 162 . Removal and Installation for Condenser ............. 185 .
Components ........................................................ 162. REMOVAL ........................................................ 185 .
Removal and Installation ..................................... 162 . INSTALLATION ................................................ 185 .
AIR MIX DOOR MOTOR (FRONT) .................. 162 . Removal and Installation for Front Evaporator .... 186 .
AIR MIX DOOR MOTOR (REAR) .................... 163 . REMOVAL ........................................................ 186 .
VARIABLE BLOWER CONTROL ......................... 164 . INSTALLATION ................................................ 187 .
Removal and Installation for Rear Evaporator ..... 188 .
Revision: March 2006 MTC-3 2007 Quest
REMOVAL ........................................................ 188
. Dye Injection ........................................................ 190
.
INSTALLATION ................................................. 189
. Electronic Refrigerant Leak Detector ................... 191 .
Removal and Installation for Front Expansion Valve 189 . PRECAUTIONS FOR HANDLING LEAK
REMOVAL ........................................................ 189
. DETECTOR ...................................................... 191 .
INSTALLATION ................................................. 189
. CHECKING PROCEDURE ............................... 192 .
Removal and Installation for Rear Expansion Valve 189 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 194 .
REMOVAL ........................................................ 189
. Service Data and Specifications (SDS) ............... 194 .
INSTALLATION ................................................. 189
. COMPRESSOR ................................................ 194 .
Checking for Refrigerant Leaks ........................... 190 . OIL .................................................................... 194
.
Checking System for Leaks Using the Fluorescent REFRIGERANT ................................................ 194 .
Dye Leak Detector ............................................... 190
. ENGINE IDLING SPEED .................................. 194 .
BELT TENSION ................................................ 194 .
Revision: March 2006 MTC-4 2007 Quest
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EJS004LO
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
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. E
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. F
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.
G
Precautions for Working with HFC-134a (R-134a) EJS004LP
WARNING:
G 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 MTC-5, "Contaminated Refrigerant" . To
determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use refrigerant recov-
ery/recycling equipment and refrigerant identifier. I
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 MTC
handling precautions must be observed:
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