INFINITI QX56 2004 Factory Service Manual

ATC-136
AMBIENT SENSOR
Revision: August 20072004 QX56
AMBIENT SENSORPFP:27722
Removal and InstallationEJS002CX
REMOVAL
1. Disconnect the ambient sensor electrical connector.
NOTE:
The ambient sensor is located behind the front bumper, in front
of the condenser.
2. Release the ambient sensor clip and then remove the ambient
sensor.
INSTALLATION
Installation is in the reverse order of removal.
WJIA0819E

IN-VEHICLE SENSOR
ATC-137
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
IN-VEHICLE SENSORPFP:27720
Removal and InstallationEJS002CY
REMOVAL
1. Remove the cluster lid D. Refer to IP-12, "Cluster Lid D" .
2. Remove the two screws and remove the in-vehicle sensor.
INSTALLATION
Installation is in the reverse order of removal.
LJIA0132E

ATC-138
OPTICAL SENSOR
Revision: August 20072004 QX56
OPTICAL SENSORPFP:28576
Removal and InstallationEJS002CZ
The optical sensor is located in the top center of the instrument
panel. Refer to LT- 6 4 , "
Removal and Installation of Optical Sensor" .
WJIA0607E

INTAKE SENSOR
ATC-139
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
INTAKE SENSORPFP:27723
Removal and InstallationEJS002D0
REMOVAL
1. Remove the instrument panel. Refer to IP-10, "INSTRUMENT PANEL ASSEMBLY" .
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

ATC-140
BLOWER MOTOR
Revision: August 20072004 QX56
BLOWER MOTORPFP:27226
ComponentsEJS002D1
Front Blower Motor
Rear Blower Motor
Removal and InstallationEJS002D2
FRONT BLOWER MOTOR
Removal
1. Remove the glove box assembly. Refer to IP-14, "Instrument Lower Cover RH and Glove Box" .
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. Variable blower control
LJIA0055E
1. Rear blower motor 2. Rear blower motor case 3. Rear blower motor resistor

BLOWER MOTOR
ATC-141
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
REAR BLOWER MOTOR
Removal
1. Remove the rear RH interior trim panel. Refer to EI-35, "CENTER PILLAR LOWER FINISHER" .
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.
LJIA0056E

ATC-142
IN-CABIN MICROFILTER
Revision: August 20072004 QX56
IN-CABIN MICROFILTERPFP:27277
Removal and InstallationEJS002D3
FUNCTION
The air inside the passenger compartment is filtered by the in-cabin
microfilters when the heater or A/C controls are set on either the
recirculation or fresh mode. The two in-cabin microfilters are located
in the front heater and cooling unit assembly. The rear heater and
cooling unit assembly only draws in air from the passenger compart-
ment to recirculate into the passenger compartment, so the rear
heater and cooling unit assembly is not equipped with in-cabin
microfilters.
REPLACEMENT TIMING
Replacement of the two in-cabin microfilters is recommended on a regular interval depending on the driving
conditions. Refer to MA-6, "
PERIODIC MAINTENANCE" . It may also be necessary to replace the two in-
cabin microfilters as part of a component replacement if the in-cabin microfilters are damaged.
REPLACEMENT PROCEDURE
1. Remove the two lower glove box hinge pins to remove the glove
box from the instrument panel and let it hang from the cord.
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 microfilter into the front heater and
cooling unit assembly housing and slide it over to the right.
Insert the second new in-cabin microfilter 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 arrow should face the rear of the
vehicle. The arrows should point downward.
LJIA0012E
WLIA0027E
LJIA0134E
LJIA0148E

IN-CABIN MICROFILTER
ATC-143
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
5. Install the in-cabin microfilter cover.
6. Install the lower glove box in the instrument panel and secure it
with the two hinge pins.
LJIA0134E
WLIA0027E

ATC-144
HEATER & COOLING UNIT ASSEMBLY
Revision: August 20072004 QX56
HEATER & COOLING UNIT ASSEMBLYPFP:27110
ComponentsEJS002D4
Front Heater and Cooling Unit Assembly
WJIA0957E
1. High-pressure A/C pipe 2. Front expansion valve 3. Low-pressure A/C pipe
4. Front heater core pipe 5. Front heater core hose 6. A/C drain hose
7. Front heater and cooling unit assembly

HEATER & COOLING UNIT ASSEMBLY
ATC-145
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
Rear A/C
Removal and InstallationEJS002D5
FRONT HEATER AND COOLING UNIT ASSEMBLY
Removal
1. Discharge the refrigerant from the A/C system. Refer to ATC-162, "Discharging Refrigerant" .
2. Drain the coolant from the engine cooling system. Refer to MA-12, "
DRAINING ENGINE COOLANT" .
3. Remove the cowl top extension. Refer to EI-18, "
Removal and Installation" .
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.