INFINITI QX56 2008 Factory Service Manual

INTAKE SENSORVTL-11
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INTAKE SENSOR
Removal and InstallationINFOID:0000000001516606
REMOVAL
1. Remove the instrument panel. Refer to IP-12, "Removal and Installation".
2. Disconnect the intake sensor electrical connector. NOTE:
The intake sensor is located on the top of the front heater and
cooling unit assembly next to the A/C evaporator cover.
3. Twist the intake sensor to remove the intake sensor from the front heater and cooling unit assembly.
INSTALLATION
Installation is in the reverse order of removal.
LJIA0133E
Revision: March 2010 2008 QX56

VTL-12
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BLOWER MOTOR
BLOWER MOTOR
ComponentINFOID:0000000001516607
Front Blower MotorRear Blower Motor
Removal and InstallationINFOID:0000000001516608
FRONT BLOWER MOTOR
Removal
1. Remove the glove box assembly. Refer to IP-17, "Removal and Installation".
2. Disconnect the front blower motor electrical connector.
3. Remove the three screws and remove the front blower motor.
Installation
Installation is in the reverse order of removal.
LJIA0136E
1. Front heater and cooling unit assembly 2. Front blower motor 3. Front variable blower control
AWIIA0085ZZ
1. Rear blower motor2. Rear heater and cooling unit assembly 3. Rear variable blower control
Revision: March 2010 2008 QX56

BLOWER MOTORVTL-13
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REAR BLOWER MOTOR
Removal
1. Remove the luggage side lower finisher RH. Refer to INT-19, "Removal and Installation".
2. Disconnect the rear blower motor electrical connector.
3. Remove the three screws and remove the rear blower motor.
Installation
Installation is in the reverse order of removal.
Revision: March 2010 2008 QX56

VTL-14
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IN-CABIN MICROFILTER
IN-CABIN MICROFILTER
Removal and InstallationINFOID:0000000001516609
REPLACEMENT PROCEDURE
1. Remove the glove box assembly from the instrument panel. Refer to IP-17, "Removal and Installation".
2. Remove the screw and remove the in-cabin microfilter cover.
3. Remove the in-cabin microfilters from the front heater and cool- ing unit assembly housing.
4. Insert the first new in-cabin micr ofilter into the front heater and
cooling unit assembly housing and slide it over to the right.
Insert the second new in-cabin mi crofilter into the front heater
and cooling unit assembly housing.
NOTE:
The in-cabin microfilters are marked with air flow arrows. The
end of the microfilter with the arro w should face the rear of the
vehicle. The arrows should point downward.
5. Install the in-cabin microfilter cover.
6. Install the glove box assembly in the instrument panel. Refer to IP-17, "
Removal and Installation".
7. Fill out the date information on the sm all replacement label and attach it to the inside of the glove box lid.
LJIA0134E
LJIA0148E
LJIA0134E
Revision: March 2010 2008 QX56

HEATER & COOLING UNIT ASSEMBLYVTL-15
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HEATER & COOLING UNIT ASSEMBLY
ComponentINFOID:0000000001516610
Front A/C System
WJIA1578E
1. High-pressure service valve 2 . Grommet 3. High-pressure pipe
4. Refrigerant pressure sensor 5. Condenser 6. Compressor shaft seal
Revision: March 2010 2008 QX56

VTL-16
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HEATER & COOLING UNIT ASSEMBLY
Rear A/C System
NOTE:
Refer to HA-5, "
Precaution for Refrigerant Connection".
Removal and InstallationINFOID:0000000001516611
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: March 2010 2008 QX56

HEATER & COOLING UNIT ASSEMBLYVTL-17
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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. Remove the steering column. Refer to ST-20, "
Removal and Installation".
9. 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 —".
10. Disconnect the steering member from each side of the vehicle body.
11. 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.
12. 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 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
7. Disconnect the ducts 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: March 2010 2008 QX56

VTL-18
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HEATER CORE
HEATER CORE
ComponentINFOID:0000000001516612
Front Heater and Cooling Unit Assembly
AWIIA0086ZZ
1. Heater core cover2. 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: March 2010 2008 QX56

HEATER COREVTL-19
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Rear Heater and Cooling Unit Assembly
Removal and InstallationINFOID:0000000001516613
FRONT HEATER CORE
Removal
1. Remove the front heater and cooling unit assembly. Refer to VTL-16, "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 core 6. Blower motor
7. Blower motor case 8. Variable blower control
Front
Revision: March 2010 2008 QX56

VTL-20
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HEATER CORE
5. Remove the heater core.NOTE:
If the in-cabin microfilters are c ontaminated from coolant leaking
from the heater core, replace the in-cabin microfilters 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: March 2010 2008 QX56