2005 INFINITI QX4 Factory Service Manual

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Page 553 of 3419

INFINITI QX4 2005 Factory Service Manual ATC-158
HEATER & COOLING UNIT ASSEMBLY
Revision: October 20052005 QX56
7. Move the two front seats to the rearmost position on the seat track.
8. Remove the instrument panel and console panel. Refer t

ATC-158
HEATER & COOLING UNIT ASSEMBLY
Revision: October 20052005 QX56
7. Move the two front seats to the rearmost position on the seat track.
8. Remove the instrument panel and console panel. Refer to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
9. Remove the steering column. Refer to PS-10, "
STEERING COLUMN" .
10. 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-4, "
POWER SUPPLY ROUTING CIRCUIT" .
11. Disconnect the steering member from each side of the vehicle body.
12. 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 attached to the steering member.
13. 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
compressor 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 MA-14, "REFILLING ENGINE
COOLANT" .
Recharge the A/C system. Refer to ATC-175, "Evacuating System and Charging Refrigerant" .
REAR HEATER AND COOLING UNIT ASSEMBLY
Removal
1. Discharge the refrigerant from the A/C system. Refer to ATC-175, "Discharging Refrigerant" .
2. Drain the coolant from the engine cooling system. Refer to MA-13, "
DRAINING ENGINE COOLANT" .
3. Disconnect the rear heater core hoses from the rear heater core.
4. Disconnect the rear A/C pipes from the rear expansion valve.
5. Remove the rear RH interior trim panel. Refer to EI-35, "
BODY
SIDE TRIM" .
6. Disconnect the following electrical connectors:
Rear blower motor
Rear blower motor resistor
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
compressor 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 MA-14, "REFILLING ENGINE
COOLANT" .
Recharge the A/C system. Refer to ATC-175, "Evacuating System and Charging Refrigerant" .
Removal and Installation for Rear Heater Core PipesEJS00536
REMOVAL
1. Drain the coolant from the engine cooling system. Refer to CO-10, "DRAINING ENGINE COOLANT" .
2. Remove the upper and lower luggage RH side finisher. Refer to EI-35, "
BODY SIDE TRIM"
LJIA0021E

Page 554 of 3419

INFINITI QX4 2005 Factory Service Manual HEATER & COOLING UNIT ASSEMBLY
ATC-159
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Revision: October 20052005 QX56
3. Disconnect the rear heater core pipes.
INSTALLATION
Installation is in the reverse order of remova

Page 555 of 3419

INFINITI QX4 2005 Factory Service Manual ATC-160
HEATER CORE
Revision: October 20052005 QX56
HEATER COREPFP:27140
ComponentsEJS003YG
Front Heater and Cooling Unit Assembly
LJIA0138E
1. Heater core cover 2. Heater core pipe bracket 3. Heater

Page 556 of 3419

INFINITI QX4 2005 Factory Service Manual HEATER CORE
ATC-161
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Revision: October 20052005 QX56
Rear Heater and Cooling Unit Assembly
Removal and InstallationEJS003YH
FRONT HEATER CORE
Removal
1. Remove the front hea

Page 557 of 3419

INFINITI QX4 2005 Factory Service Manual ATC-162
HEATER CORE
Revision: October 20052005 QX56
5. Remove the heater core.
NOTE:
If the in-cabin microfilters are contaminated from coolant leaking
from the heater core, replace the in-cabin micro

Page 558 of 3419

INFINITI QX4 2005 Factory Service Manual DEFROSTER DOOR MOTOR
ATC-163
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Revision: October 20052005 QX56
DEFROSTER DOOR MOTORPFP:27733
Removal and InstallationEJS003YI
Defroster Door Motor - Front Heater and Cooling

Page 559 of 3419

INFINITI QX4 2005 Factory Service Manual ATC-164
INTAKE DOOR MOTOR
Revision: October 20052005 QX56
INTAKE DOOR MOTORPFP:27730
Removal and InstallationEJS003YJ
Intake Door Motor - Front Heater and Cooling Unit Assembly
REMOVAL
1. Remove the f

Page 560 of 3419

INFINITI QX4 2005 Factory Service Manual MODE DOOR MOTOR
ATC-165
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Revision: October 20052005 QX56
MODE DOOR MOTORPFP:27731
Removal and InstallationEJS003YK
Mode Door Motor - Front Heater and Cooling Unit Assembly
R

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