INFINITI QX56 2010 Factory Service Manual

EVAPORATORVTL-19
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EVAPORATOR
Removal and Installation for Front EvaporatorINFOID:0000000005147626
Front Heater and Cooling Unit Assembly
REMOVAL
1. Remove the front heater core. Refer to VTL-24, "Removal and Installation".
AWIIA0086ZZ
1. Heater core cover 2. Heater core pipe bracket3. 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
Front
Revision: April 20092010 QX56

VTL-20
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EVAPORATOR
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 A/C refrigerant pipes with new ones, then apply compressor oil to them
when installing them.
• After charging the refrigerant, check for leaks.
Removal and Installation for Rear EvaporatorINFOID:0000000005147627
Rear Heater and Cooling Unit Assembly
AWIIA0087ZZ
1. Front cover 2. Evaporator and heater core case 3. Evaporator
4. Side cover 5. Heater core6. Blower motor
7. Blower motor case 8. Variable blower control
Front
Revision: April 20092010 QX56

EVAPORATORVTL-21
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REMOVAL
1. Remove the rear heater and cooling unit assembly from the vehicle. Refer to VTL-17, "Removal and
Installation".
2. Remove the blower motor.
3. Remove the variable blower control.
4. Remove the air mix door motor.
5. Remove the mode door motor.
6. Remove the rear duct and mode door assembly. Refer to VTL-36, "
Removal and Installation".
7. Disassemble the rear heater and cooling unit assembly to remove the evaporator.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Replace the O-rings on the rear A/C pipes with new ones. Apply compressor oil to the O-rings when installing them.
• After charging the refrigerant, check for leaks.
Revision: April 20092010 QX56

VTL-22
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EXPANSION VALVE
EXPANSION VALVE
Removal and Installation for Rear Expansion ValveINFOID:0000000005147628
REMOVAL
1. Discharge the refrigerant. Refer to HA-20, "HFC-134a (R-134a) Service Procedure".
2. Remove the luggage side finisher lower (RH). Refer to INT-19, "
Removal and Installation".
3. Disconnect the A/C refrigerant pipes from the expansion valve. CAUTION:
Cap or wrap the A/C refrigerant pipe ends with a suitable material such as vinyl tape to avoid the
entry of air and contaminants.
4. Remove the expansion valve.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Replace the O-rings on the A/C re frigerant pipes with new ones, then apply compressor oil to them
when installing them.
• After charging the refrigerant, check for leaks. Expansion valve bolts
: 4 N·m (0.41 kg-m, 35 in-lb)
A/C refrigerant pipe to exp ansion valve bolt : Refer to HA-29, "
Component".
Revision: April 20092010 QX56

HEATER COREVTL-23
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HEATER CORE
ComponentINFOID:0000000005147614
Front Heater and Cooling Unit Assembly
AWIIA0086ZZ
1. Heater core cover 2. Heater core pipe bracket3. 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
Front
Revision: April 20092010 QX56

VTL-24
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HEATER CORE
Rear Heater and Cooling Unit Assembly
Removal and InstallationINFOID:0000000005147615
FRONT HEATER CORE
Removal
1. Remove the front heater and cooling unit assembly. Refer to VTL-17, "Removal and Installation".
2. Remove the four screws and remove the upper bracket.
3. Remove the four screws and remove the heater core cover.
4. Remove the heater core pipe bracket.
AWIIA0087ZZ
1. Front cover 2. Evaporator and heater core case 3. Evaporator
4. Side cover 5. Heater core6. Blower motor
7. Blower motor case 8. Variable blower control
Front
Revision: April 20092010 QX56

HEATER COREVTL-25
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5. Remove the heater core. NOTE:
If equipped and the in-cabin microfilters are contaminated from
coolant leaking from the heater core, replace the in-cabin micro-
filters with new ones before installing the new heater core.
Installation
Installation is in the reverse order of removal.
REAR HEATER CORE
Removal
1. Partially drain the engine cooling system. Refer to CO-11, "Changing Engine Coolant".
2. Remove the luggage side finisher lower RH. Refer to INT-19, "
Removal and Installation".
3. Disconnect the rear heater hoses from the heater core.
4. Remove the rear heater core bracket.
5. Remove the heater core.
Installation
Installation is in the reverse order of removal.
LJIA0134E
Revision: April 20092010 QX56

VTL-26
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DEFROSTER DOOR MOTOR
DEFROSTER DOOR MOTOR
Removal and InstallationINFOID:0000000005147616
Defroster Door Motor - Front Heater and Cooling Unit Assembly
REMOVAL
1. Remove the BCM. Refer to BCS-59, "Removal and Installation".
2. Remove the Bose speaker amplifier if equipped. Refer to AV-182, "
Removal and Installation".
3. Disconnect the defroster door motor electrical connector.
4. Remove the three screws and remove the defroster 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 (driver)
4. Variable blower control 5. Air mix door motor (passenger) 6. Mode door motor
7. Defroster door motor
Revision: April 20092010 QX56

INTAKE DOOR MOTORVTL-27
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INTAKE DOOR MOTOR
Removal and InstallationINFOID:0000000005147617
Intake Door Motor - Front Heater and Cooling Unit Assembly
REMOVAL
1. Remove the front heater and cooling unit assembly. Refer to VTL-17, "Removal and Installation".
2. Remove the steering member from the front heater and cooling unit assembly.
3. Disconnect the intake door motor electrical connector.
4. Remove the three screws and remove the intake 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 (driver)
4. Variable blower control 5. Air mix door motor (passenger) 6. Mode door motor
7. Defroster door motor
Revision: April 20092010 QX56

VTL-28
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MODE DOOR MOTOR
MODE DOOR MOTOR
ComponentsINFOID:0000000005147618
Front Mode Door Motor - Front Heater and Cooling Unit Assembly
LJIA0139E
1. Front heater and cooling unit assembly 2. Intake door motor3. Air mix door motor (driver)
4. Variable blower control 5. Air mix door motor (passenger) 6. Mode door motor
7. Defroster door motor
Revision: April 20092010 QX56