heater INFINITI QX56 2010 Factory Manual PDF

VTL-16
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HEATER & COOLING UNIT ASSEMBLY
HEATER & COOLING UNIT ASSEMBLY
ComponentINFOID:0000000005147612
Front A/C System
WJIA1578E
1. High-pressure service valve 2. Grommet3. High-pressure pipe
4. Refrigerant pressure sensor 5. Condenser 6. Compressor shaft seal
Revision: April 20092010 QX56

HEATER & COOLING UNIT ASSEMBLYVTL-17
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Rear A/C System
NOTE:
Refer to HA-5, "
Precaution for Refrigerant Connection".
Removal and InstallationINFOID:0000000005147613
FRONT HEATER AND COOLING UNIT ASSEMBLY
Removal
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
AWIIA0134GB
1. Rear heater and cooling unit assembly 2. Rear A/C pipes 3. Rear A/C heater core pipes
4. Rear heater core hose 5. Rear blower motor6. Underfloor rear A/C pipes
7. Underfloor rear heater core pipes A. Bolt torque specification B. Leak checking order (l - r)
C. Tightening torque D. Wrench sizeE. O-ring size
Front
NOTE: The O-ring size 8 is the high-side and the O-ring size 16 is the low-side.
Revision: April 20092010 QX56

VTL-18
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HEATER & COOLING UNIT ASSEMBLY
1. Move the two front seats to the rear most position on the seat track.
2. Disconnect the battery negative terminal and battery positive terminal.
3. Discharge the refrigerant from the A/C system. Refer to HA-20, "
HFC-134a (R-134a) Service Procedure".
4. Drain the coolant from the engine cooling system. Refer to CO-11, "
Changing Engine Coolant".
5. Disconnect the front heater hoses from the front heater core.
6. Disconnect the high/low pressure pipes from the front expansion valve.
7. Remove the instrument panel and console panel. Refer to IP-12, "
Removal and Installation".
8. Disconnect the instrument panel wire harness at the RH and LH in-line connector brackets, and the fuse block (J/B) electrical connectors. Refer to PG-9, "
Wiring Diagram — Battery Power Supply —".
9. Disconnect the steering member from each side of the vehicle body.
10. Remove the front heater and cooling unit assembly with it attached to the steering member, from the vehi-
cle.
CAUTION:
Use care not to damage the seats and interior tr im panels when removing the front heater and
cooling unit assembly with it at tached to the steering member.
11. Remove the front heater and cooling unit assembly from the steering member.
Installation
Installation is in the reverse order of removal.
CAUTION:
• Replace the O-ring of the low-pressure pipe and high-pressure pipe with a new one, and apply com-
pressor oil to it when installing it.
• After charging the refrigerant, check for leaks.
NOTE:
• Fill the engine cooling system with the specified coolant mixture. Refer to CO-11, "
Changing Engine Cool-
ant".
• Recharge the A/C system. Refer to HA-20, "
HFC-134a (R-134a) Service Procedure".
REAR HEATER AND COOLING UNIT ASSEMBLY
Removal
1. Discharge the refrigerant from the A/C system. Refer to HA-20, "HFC-134a (R-134a) Service Procedure".
2. Drain the coolant from the engine cooling system. Refer to CO-11, "
Changing Engine Coolant".
3. Remove the luggage side finisher lower and upper RH. Refer to INT-19, "
Removal and Installation".
4. Disconnect the rear heater core hoses from the rear heater core.
5. Disconnect the rear A/C pipes from the rear expansion valve.
6. Disconnect the following electrical connectors: • Rear blower motor
• Rear variable blower control
• Rear air mix door motor
• Rear mode door motor
7. Disconnect the ducts and drain tube from the rear heater and cooling unit assembly.
8. Remove the rear heater and cooling unit assembly.
Installation
Installation is in the reverse order of removal.
CAUTION:
• Replace the O-ring of the low-pressure pipe and high-pressure pipe with a new one, and apply com-
pressor oil to it when installing it.
• After charging the refrigerant, check for leaks.
NOTE:
• Fill the engine cooling system with the specified coolant mixture. Refer to CO-11, "
Changing Engine Cool-
ant".
• Recharge the A/C system. Refer to HA-20, "
HFC-134a (R-134a) Service Procedure".
Revision: April 20092010 QX56

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

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