2009 INFINITI QX56 Factory Service Manual

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Page 3953 of 4171

INFINITI QX56 2009 Factory Service Manual BLOWER MOTORVTL-13
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Installation is in the reverse order of removal.
REAR BLOWER MOTOR
Removal
1. Remove the rear heater and cooling unit assembly

Page 3954 of 4171

INFINITI QX56 2009 Factory Service Manual VTL-14
< ON-VEHICLE REPAIR >
IN-CABIN MICROFILTER
IN-CABIN MICROFILTER
Removal and InstallationINFOID:0000000003775267
REPLACEMENT PROCEDURE
1. Remove the glove box assembly from the instrument panel.

Page 3955 of 4171

INFINITI QX56 2009 Factory Service Manual HEATER & COOLING UNIT ASSEMBLYVTL-15
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HEATER & COOLING UNIT ASSEMBLY
ComponentINFOID:0000000003775268
Front A/C System
ALIIA0402ZZ
1. High-pressur

Page 3956 of 4171

INFINITI QX56 2009 Factory Service Manual VTL-16
< ON-VEHICLE REPAIR >
HEATER & COOLING UNIT ASSEMBLY
Rear A/C System
NOTE:
Refer to HA-5, "
Precaution for Refrigerant Connection".
Removal and InstallationINFOID:0000000003775269
FRONT HEATER

Page 3957 of 4171

INFINITI QX56 2009 Factory Service Manual HEATER & COOLING UNIT ASSEMBLYVTL-17
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Removal
1. Move the two front seats to the rear most position on the seat track.
2. Disconnect the battery n

HEATER & COOLING UNIT ASSEMBLYVTL-17
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Removal
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-13, "
Removal and Installation".
8. Disconnect the instrument panel wire harness at t he 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 trim 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 uni t 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: December 20092009 QX56

Page 3958 of 4171

INFINITI QX56 2009 Factory Service Manual VTL-18
< ON-VEHICLE REPAIR >
HEATER CORE
HEATER CORE
ComponentINFOID:0000000003775270
Front Heater and Cooling Unit Assembly
AWIIA0086ZZ
1. Heater core cover2. Heater core pipe bracket3. Heater core
4

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INFINITI QX56 2009 Factory Service Manual HEATER COREVTL-19
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Rear Heater and Cooling Unit Assembly
Removal and InstallationINFOID:0000000003775271
FRONT HEATER CORE
Removal
1. Remove the f

Page 3960 of 4171

INFINITI QX56 2009 Factory Service Manual VTL-20
< ON-VEHICLE REPAIR >
HEATER CORE
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 micr

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