heater INFINITI QX4 2005 Factory Owner's Manual

MODE DOOR MOTOR
ATC-165
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Revision: October 20052005 QX56
MODE DOOR MOTORPFP:27731
Removal and InstallationEJS003YK
Mode Door Motor - Front Heater and Cooling Unit Assembly
REMOVAL
1. Remove the center console lower cover LH. Refer to IP-10, "INSTRUMENT PANEL ASSEMBLY"
2. Disconnect the mode door motor electrical connector.
3. Remove the two screws and remove the mode door motor.
INSTALLATION
Installation is in the reverse order of removal.
LJIA0139E
1. Front heater and cooling unit assembly 2. Intake door motor 3. Air mix door motor (passenger)
4. Variable blower control 5. Air mix door motor (driver) 6. Mode door motor
7. Defroster door motor

ATC-166
AIR MIX DOOR MOTOR
Revision: October 20052005 QX56
AIR MIX DOOR MOTOR PFP:27732
ComponentsEJS003YL
Air Mix Door Motors - Front Heater and Cooling Unit Assembly
Removal and InstallationEJS003YM
FRONT AIR MIX DOOR MOTOR (DRIVER)
Removal
1. Remove the center console lower cover LH. Refer to IP-10, "INSTRUMENT PANEL ASSEMBLY" .
2. Disconnect the air mix door motor electrical connector.
3. Remove the three screws and remove the air mix door motor.
Installation
Installation is in the reverse order of removal.
LJIA0139E
1. Front heater and cooling unit assembly 2. Intake door motor 3. Air mix door motor (passenger)
4. Variable blower control 5. Air mix door motor (driver) 6. Mode door motor
7. Defroster door motor

AIR MIX DOOR MOTOR
ATC-167
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Revision: October 20052005 QX56
FRONT AIR MIX DOOR MOTOR (PASSENGER)
Removal
1. Remove the front heater and cooling unit assembly. Refer to ATC-157, "FRONT HEATER AND COOLING
UNIT ASSEMBLY" .
2. Remove the steering member from the front heater and cooling unit assembly.
3. Disconnect the air mix door motor electrical connector.
4. Remove the three screws and remove the air mix door motor.
Installation
Installation is in the reverse order of removal.
REAR AIR MIX DOOR MOTOR
Removal
1. Remove the RH rear interior trim panel. Refer to EI-35, "BODY SIDE TRIM" .
2. Disconnect the rear air mix door motor electrical connector.
3. Remove the three screws and remove the rear air mix door
motor.
Installation
Installation is in the reverse order of removal.
LJIA0021E

ATC-168
VARIABLE BLOWER CONTROL
Revision: October 20052005 QX56
VARIABLE BLOWER CONTROLPFP:27200
Removal and InstallationEJS003YN
Variable Blower Control - Front Heater and Cooling Unit Assembly
REMOVAL
1. Remove the glove box assembly. Refer to IP-14, "Instrument Lower Cover RH and Glove Box" .
2. Disconnect the variable blower control electrical connector.
3. Remove the two screws and remove the variable blower control.
INSTALLATION
Installation is in the reverse order of removal.
LJIA0139E
1. Front heater and cooling unit assembly 2. Intake door motor 3. Air mix door motor (passenger)
4. Variable blower control 5. Air mix door motor (driver) 6. Mode door motor
7. Defroster door motor

ATC-170
DUCTS AND GRILLES
Revision: October 20052005 QX56
DUCTS AND GRILLESPFP:27860
ComponentsEJS003YP
Ducts - Front Heater and Cooling Unit Assembly
WJIA0956E

DUCTS AND GRILLES
ATC-171
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Revision: October 20052005 QX56
Ducts - Rear Heater and Cooling Unit Assembly
1. Defroster nozzle 2. LH side demister duct 3. LH ventilator duct
4. RH side demister duct 5. RH ventilator duct 6. Center ventilator duct
7. Front heater and cooling unit assembly 8. Floor duct 9. Clips
10. Heat duct
LJIA0142E
1. Rear floor duct 2. Rear heater and cooling unit assembly 3. Rear lower overhead duct
4. Rear upper overhead duct

ATC-178
REFRIGERANT LINES
Revision: October 20052005 QX56
Rear A/C
NOTE:
Refer to AT C - 7 , "
Precautions for Refrigerant Connection" .
1. High-pressure service valve 2. Grommet 3. High-pressure pipe
4. Refrigerant pressure sensor 5. Condenser 6. Compressor shaft seal
7. High-pressure flexible hose 8. Low-pressure flexible hose 9. Low-pressure service valve
10. Low-pressure pipe 11. Expansion valve (front) 12. Drain hose
WJIA2001E
1. Rear A/C pipes 2. Underfloor rear A/C pipes 3. Underfloor rear heater pipes
⇐Front

ATC-184
REFRIGERANT LINES
Revision: October 20052005 QX56
CAUTION:

Replace the O-ring of the high-pressure pipe with a new one, then apply compressor oil to it when
installing it.

After charging refrigerant, check for leaks.
Removal and Installation for Low-pressure PipeEJS003YY
REMOVAL
1. Discharge the refrigerant. Refer to ATC-175, "HFC-134a (R-134a) Service Procedure" .
2. Remove the cowl top and the cowl top extension. Refer to EI-18, "
COWL TOP" .
3. Remove the low-pressure pipe.
CAUTION:
Cap or wrap the joint of the pipes with suitable material such as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is in the reverse order of removal.
Refer to ATC-177, "
Components" .
CAUTION:

Replace the O-ring of the high/low-pressure pipe with a new one, then apply compressor oil to it
when installing it.

After charging refrigerant, check for leaks.
Removal and Installation for Underfloor Rear A/C PipesEJS00537
REMOVAL
1. Drain the coolant from the engine cooling system. Refer to CO-10, "DRAINING ENGINE COOLANT" .
2. Diconnect the negative battery terminal.
3. Discharge the refrigerant from the A/C system. Refer to ATC-175, "
HFC-134a (R-134a) Service Proce-
dure" .
4. Disconnect the chassis harness connector.
5. Set four suitable jacks at the body mounting points to support the vehicle body when it is seperated from
the frame.
6. Remove the RH body mount bolts. Refer to BL-159, "
Body Mounting"
7. Use the vehicle hoist to lower the frame from the body until there is sufficient clearance for the underfloor
rear high- and low-pressure A/C and heater core pipes from the body.
8. Remove the underfloor rear high- and low-pressure A/C and heater core pipes .
INSTALLATION
Installation is in the reverse order of removal.
Refer to ATC-177, "
Components" .
CAUTION:

Replace the O-rings of the high-pressure pipe and the high-pressure flexible hose with new ones,
then apply compressor oil to them after installing them.

After charging refrigerant, check for leaks.
Removal and Installation for Rear A/C PipesEJS00538
REMOVAL
1. Discharge the refrigerant from the A/C system. Refer to ATC-175, "HFC-134a (R-134a) Service Proce-
dure"
2. Remove the upper and lower luggage RH side finisher lower. Refer to EI-35, "BODY SIDE TRIM"
3. Disconnect the rear A/C pipes.
INSTALLATION
Installation is in the reverse order of removal.
Refer to ATC-177, "
Components" .
CAUTION:

Replace the O-rings of the high-pressure pipe and the high-pressure flexible hose with new ones,
then apply compressor oil to them after installing them.

After charging refrigerant, check for leaks.

ATC-186
REFRIGERANT LINES
Revision: October 20052005 QX56
Removal and Installation for Front EvaporatorEJS003Z1
Front Heater and Cooling Unit Assembly
REMOVAL
1. Remove the front heater core. Refer to ATC-161, "FRONT HEATER CORE" .
LJIA0138E
1. Heater core cover 2. Heater core pipe bracket 3. Heater core
4. Upper bracket 5. Upper heater and cooling unit case 6. A/C evaporator
7. Lower heater and cooling unit case 8. Blower motor 9. Variable blower control

REFRIGERANT LINES
ATC-187
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Revision: October 20052005 QX56
2. Remove the defroster mode door arm.
3. Separate the heater core and cooling unit case.
4. Remove the evaporator.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
Replace the O-rings on the low-pressure flexible hose and the high-pressure pipe with new ones.
Apply compressor oil to the O-rings before installing them.
Removal and Installation for Rear EvaporatorEJS003Z2
Rear Heater and Cooling Unit Assembly
LJIA0135E
1. Front cover 2. Evaporator and heater core case 3. Evaporator
4. Side cover 5. Heater core 6. Rear blower motor
7. Blower motor case 8. Rear blower motor resistor