cooling INFINITI QX56 2007 Factory Workshop Manual

DUCTS AND GRILLESATC-145
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DUCTS AND GRILLES
ComponentINFOID:0000000003533289
Ducts - Front Heater and Cooling Unit Assembly
WJIA0956E
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

ATC-146
< SERVICE INFORMATION >
DUCTS AND GRILLES
Ducts - Rear Heater and Cooling Unit Assembly
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-148
< SERVICE INFORMATION >
DUCTS AND GRILLES
Removal and Installation
INFOID:0000000003533290
CENTER CONSOLE HEAT DUCT AND REAR FINISHER ASSEMBLY GRILLE
Removal
The center console must be removed and disassembled to remove the heat duct and rear finisher assembly
grille. Refer to IP-10, "
Removal and Installation".
Installation
Installation is in the reverse order of removal.
DEFROSTER NOZZLE
Removal
1. Remove the instrument panel trim. Refer to IP-10, "Removal and Installation".
2. Remove the front heater and cooling unit assembly. Refer to ATC-133, "
Removal and Installation".
3. Remove the defroster nozzle.
Installation
Installation is in the reverse order of removal.
RH AND LH SIDE DEMISTER DUCT
Removal
1. Remove the instrument panel trim. Refer to IP-10, "Removal and Installation".
2. Remove the front heater and cooling unit assembly. Refer to ATC-133, "
Removal and Installation".
3. Remove the RH or LH side demister duct.
Installation
Installation is in the reverse order of removal.
RH AND LH VENTILATOR DUCT
Removal
1. Remove the instrument panel trim. Refer to IP-10, "Removal and Installation".
2. Remove the front heater and cooling unit assembly. Refer to ATC-133, "
Removal and Installation".
3. Remove the RH or LH ventilator duct.
Installation
Installation is in the reverse order of removal.
CENTER VENTILATOR DUCT
Removal
1. Remove the instrument panel trim. Refer to IP-10, "Removal and Installation".
2. Remove the front heater and cooling unit assembly. Refer to .
3. Remove the defroster nozzle.
4. Remove the RH and LH side demister ducts.
5. Remove the RH and LH ventilator ducts.
6. Remove the center ventilator duct.
Installation
Installation is in the reverse order of removal.
FLOOR DUCT
Removal
1. Remove the floor carpet. Refer to EI-36.
2. Remove the two clips and remove the floor duct.
Installation
Installation is in the reverse order of removal.

REFRIGERANT LINESATC-151
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*1 AT C - 2 0 , "Maintenance of Oil Quanti-
ty in Compressor"
*3ATC-167, "Electronic Refrigerant
Leak Detector"
*5 AT C - 3 , "Contaminated Refrigerant"
*2ATC-166, "Checking of Refrigerant
Leaks"
*4ATC-100, "Insufficient Cooling"
WJIA1923E

REFRIGERANT LINESATC-153
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Rear A/C
NOTE:
Refer to AT C - 4 , "
Precaution for Refrigerant Connection".
WJIA2315E
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 motor 6. Underfloor rear A/C pipes
7. Underfloor rear heater core pipes A. Bolt torque specifications B. Leak checking order (l - r)
C. Tightening torque D. Wrench size E. O-ring size
⇐Front
NOTE: The O-ring size 8 is the high-side and the O-ring size 16 is the low-side.

REFRIGERANT LINESATC-159
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Refer to ATC-152, "Component".
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 PipeINFOID:0000000003533298
REMOVAL
1. Discharge the refrigerant. Refer to ATC-150, "HFC-134a (R-134a) Service Procedure".
2. Remove the cowl top and the cowl top extension. Refer to EI-17
.
3. Remove the low-pressure pipe. CAUTION:
Cap or wrap the joint of the pipes with suitable material such as viny l tape to avoid the entry of air.
INSTALLATION
Installation is in the reverse order of removal.
Refer to ATC-152, "
Component".
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 Rear High- and Low-Pressure A/C and Heater Core Pipes
INFOID:0000000003533299
REMOVAL
1. Discharge the refrigerant. Refer to ATC-150, "HFC-134a (R-134a) Service Procedure".
2. Drain the coolant from the engine cooling system. Refer to CO-9, "
Changing Engine Coolant".
3. Disconnect the underfloor rear heater hoses (1 and 2) from the rear heater pipes underneath the vehicle.
•⇐ : Front
4. Remove the rear high- and low-pressure pipes bolt (A) to dis- connect the rear high- and low-pressure pipes from the under-
floor rear high- and low-pressu re pipes underneath the vehicle.
CAUTION:
Cap or wrap the joint of the pipes with suitable material
such as vinyl tape to avo id the entry of air.
5. Remove the rear high- and low-pressure pipes nuts (B) under- neath the vehicle.
NOTE:
The remaining steps are performed inside the rear luggage area of the vehicle.
6. Remove the luggage side finisher lower RH. Refer to EI-39
.
7. Disconnect the rear heater core hoses (1 and 2) from the rear heater core (3).
•⇐ : Front
WJIA2310E
WJIA2311E

ATC-160
< SERVICE INFORMATION >
REFRIGERANT LINES
8. Remove the rear high- and low-pressure pipes bracket bolt (A)to release the bracket.
• Rear blower motor (1)
•⇐ : Front
9. Remove the rear high- and low-pressure pipes bolt (A) to dis- connect the rear high- and low-pressure pipes from the rear
expansion valve (1).
•⇐ : Front
CAUTION:
Cap or wrap the joint of the pipes with suitable material
such as vinyl tape to avoid the entry of air.
10. Disconnect the following electrical connectors: • Rear air mix door motor (1)
• Rear blower motor resistor (2)
• Rear blower motor (3)
•⇐ : Front
11. Disconnect the ducts from the rear heater and cooling unit assembly. Refer to ATC-145, "
Component".
12. Remove the rear heater and cooling unit assembly. CAUTION:
Cap or wrap the joint of the pipes with suitable material such as viny l tape to avoid the entry of air.
13. Remove the rear high- and low-pressure A/C pipes.
INSTALLATION
Installation is in the reverse order of removal.
Refer to ATC-152, "
Component".
CAUTION:
• Replace the O-ring of th e 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 Installati on for Underfloor Rear High- and Low-Pressure A/C and Heater
Core Pipes
INFOID:0000000003533300
REMOVAL
1. Drain the coolant from the engine cooling system. Refer to CO-9, "Changing Engine Coolant".
2. Disconnect the battery negative terminal.
3. Disconnect the generator harness.
4. Discharge the refrigerant. Refer to ATC-150, "
HFC-134a (R-134a) Service Procedure".
WJIA2312E
WJIA2313E
WJIA2314E

REFRIGERANT LINESATC-163
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Removal and Installation for Front EvaporatorINFOID:0000000003533303
Front Heater and Cooling Unit Assembly
REMOVAL
1. Remove the front heater core. Refer to ATC-136, "Removal and Installation".
2. Remove the defroster mode door arm.
3. Separate the heater core and cooling unit case.
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

ATC-164
< SERVICE INFORMATION >
REFRIGERANT LINES
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 hi gh-pressure pipe with new ones.
Apply compressor oil to the O- rings when installing them.
Removal and Installation for Rear EvaporatorINFOID:0000000003533304
Rear Heater and Cooling Unit Assembly
REMOVAL
1. Remove the rear heater and cooling unit assembly from the vehicle. Refer\
to ATC-133, "Removal and
Installation".
2. Remove the rear blower motor.
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

REFRIGERANT LINESATC-165
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3. Remove the rear blower speed resistor.
4. Remove the rear air mix door motor.
5. Remove the rear duct and blend door assembly. Refer to AT C -
148, "Removal and Installation".
6. 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 ne w ones. Apply compressor oil to the O-rings when
installing them.
• After charging refrigerant, check for leaks.
Removal and Installation for Front Expansion ValveINFOID:0000000003533305
REMOVAL
1. Discharge the refrigerant. Refer to ATC-150, "HFC-134a (R-134a) Service Procedure".
2. Remove the front evaporator. Refer to ATC-163, "
Removal and Installation for Front Evaporator".
3. Remove the cooler grommet.
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 refrigerant, check for leaks.
Removal and Installation for Rear Expansion ValveINFOID:0000000003533306
REMOVAL
1. Discharge the refrigerant. Refer to ATC-150, "HFC-134a (R-134a) Service Procedure".
2. Remove the luggage side lower finisher RH. Refer to EI-39
.
3. Disconnect the A/C refrigerant pi pes 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.
LJIA0021E
WJIA0582E
Expansion valve bolts : 4 N·m (0.41 kg-m, 35 in-lb)
A/C refrigerant pipe to expansion valve bolt : Refer to ATC-152, "
Component".