2004 INFINITI FX35 heater

ATC-3
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AT C
Revision: 2004 November 2004 FX35/FX45COMPONENT INSPECTION ............................. 112
Intake Sensor Circuit ............................................. 113
COMPONENT DESCRIPTION .......................... 113
DIAGNOSTIC PROCEDURE FOR INTAKE SEN-
SOR ................................................................... 113
COMPONENT INSPECTION ............................. 114
CONTROLLER ........................................................115
Removal and Installation of A/C and AV Switch .... 115
REMOVAL .......................................................... 115
INSTALLATION .................................................. 115
AUTO AMP ..............................................................116
Removal and Installation of Unified Meter and A/C
Amp. ...................................................................... 116
REMOVAL .......................................................... 116
INSTALLATION .................................................. 116
AMBIENT SENSOR .................................................117
Removal and Installation ....................................... 117
REMOVAL .......................................................... 117
INSTALLATION .................................................. 117
IN-VEHICLE SENSOR .............................................118
Removal and Installation ....................................... 118
REMOVAL .......................................................... 118
INSTALLATION .................................................. 118
SUNLOAD SENSOR ...............................................119
Removal and Installation ....................................... 119
REMOVAL .......................................................... 119
INSTALLATION .................................................. 119
INTAKE SENSOR ................................................... 120
Removal and Installation ...................................... 120
REMOVAL ......................................................... 120
INSTALLATION ................................................. 120
BLOWER UNIT ....................................................... 121
Removal and Installation ...................................... 121
REMOVAL ......................................................... 121
INSTALLATION ................................................. 121
Disassembly and Assembly ................................. 122
BLOWER MOTOR .................................................. 123
Removal and Installation ...................................... 123
REMOVAL ......................................................... 123
INSTALLATION ................................................. 123
INTAKE DOOR MOTOR ......................................... 124
Removal and Installation ...................................... 124
REMOVAL ......................................................... 124
INSTALLATION ................................................. 124
IN-CABIN MICROFILTER ....................................... 125
Removal and Installation ...................................... 125
FUNCTION ........................................................ 125
REPLACEMENT TIMING .................................. 125
REPLACEMENT PROCEDURES ..................... 125
HEATER & COOLING UNIT ASSEMBLY .............. 126
Removal and Installation ...................................... 126
REMOVAL ......................................................... 126
INSTALLATION ................................................. 127
Disassembly and Assembly ................................. 128
MODE DOOR MOTOR ........................................... 130
Removal and Installation ...................................... 130
REMOVAL ......................................................... 130
INSTALLATION ................................................. 130AIR MIX DOOR MOTOR .........................................131
Removal and Installation ......................................131
REMOVAL .........................................................131
INSTALLATION .................................................131
HEATER CORE .......................................................132
Removal and Installation ......................................132
REMOVAL .........................................................132
INSTALLATION .................................................132
DUCTS AND GRILLES ...........................................133
Removal and Installation ......................................133
REMOVAL .........................................................133
INSTALLATION .................................................136
REFRIGERANT LINES ...........................................137
HFC-134a (R-134a) Service Procedure ...............137
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................137
Components .........................................................139
VK45DE .............................................................139
VQ35DE ............................................................140
Removal and Installation of Compressor ..............140
REMOVAL .........................................................140
INSTALLATION .................................................142
Removal and Installation of Compressor Clutch ..143
REMOVAL .........................................................143
INSTALLATION .................................................145
Removal and Installation of Low-pressure Flexible
Hose .....................................................................147
REMOVAL .........................................................147
INSTALLATION .................................................148
Removal and Installation of High-pressure Flexible
Hose .....................................................................148
REMOVAL .........................................................148
INSTALLATION .................................................149
Removal and Installation of Low-pressure Pipe 1
(Engine Compartment) .........................................149
REMOVAL .........................................................149
INSTALLATION .................................................150
Removal and Installation of High-pressure Pipe 1
and 2 (Engine Compartment) ...............................150
REMOVAL .........................................................150
INSTALLATION .................................................151
Removal and Installation of Low-pressure Pipe 2
and High-pressure Pipe 3 .....................................151
REMOVAL .........................................................151
INSTALLATION .................................................152
Removal and Installation of Liquid Tank ...............153
REMOVAL .........................................................153
INSTALLATION .................................................153
Removal and Installation of Condenser ................154
REMOVAL .........................................................154
INSTALLATION .................................................154
Removal and Installation of Refrigerant Pressure
Sensor ..................................................................155
REMOVAL .........................................................155
INSTALLATION .................................................155
Removal and Installation of Evaporator ................155
REMOVAL .........................................................155
INSTALLATION .................................................155
Removal and Installation of Expansion Valve .......156

ATC-72
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet set by the unified
meter and A/C amp. Motor rotation is conveyed to a link which acti-
vates the mode door.
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnostic procedure for AT C - 6 6 , "
DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
RJIA1778E
RJIA0890E

TROUBLE DIAGNOSIS
ATC-75
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AT C
Revision: 2004 November 2004 FX35/FX45
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the heater & cooling unit. It
rotates so that the air mix door is opened or closed to a position set
by the unified meter and A/C amp. Motor rotation is conveyed
through a shaft and the air mix door position is then fed back to the
unified meter and A/C amp. by PBR built-in air mix door motor.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR
Perform diagnostic procedure for AT C - 6 6 , "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
Air Mix Door Motor PBR CircuitAJS0014V
SYMPTOM:

Discharge air temperature does not change.

PBR circuit is open or shorted.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR PBR
Perform diagnostic procedure for AT C - 6 6 , "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
RJIA0893E
RJIA0894E

TROUBLE DIAGNOSIS
ATC-107
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Revision: 2004 November 2004 FX35/FX45
In-vehicle Sensor CircuitAJS00155
COMPONENT DESCRIPTION
In-vehicle Sensor
The in-vehicle sensor is located on instrument driver lower panel. It
converts variations in temperature of compartment air drawn from
the aspirator into a resistance value. It is then input into the unified
meter and A/C amp.
Aspirator
The aspirator is located on driver′s side of heater & cooling unit. It
produces vacuum pressure due to air discharged from the heater &
cooling unit, continuously taking compartment air in the aspirator.
RJIA2021E
RJIA0921E
RJIA1804E

TROUBLE DIAGNOSIS
ATC-113
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Revision: 2004 November 2004 FX35/FX45
Intake Sensor CircuitAJS00157
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit. It converts
temperature of air after it passes through the evaporator into a resis-
tance value which is then input to the unified meter and A/C amp.
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. (24 or −24 is
indicated on unified meter and A/C amp. as a result of performing
Self-diagnosis STEP-2.)
1. CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Disconnect intake sensor connector.
2. Turn ignition switch ON.
3. Check voltage between intake sensor harness connector M254
terminal 2 (R) and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between intake sensor harness connector
M254 terminal 1 (W) and unified meter and A/C amp. harness
connector M57 terminal 49 (W/G).
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
RJIA0928E
RJIA1458E
2 – Ground : Approx. 5V
RJIA2031E
1 – 49 : Continuity should exist.
RJIA2032E

ATC-126
HEATER & COOLING UNIT ASSEMBLY
Revision: 2004 November 2004 FX35/FX45
HEATER & COOLING UNIT ASSEMBLYPFP:27110
Removal and InstallationAJS0015J
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge refrigerant.
2. Drain coolant from cooling system. Refer to CO-11, "
Changing Engine Coolant" (VQ35DE) or CO-36,
"Changing Engine Coolant" (VK45DE).
3. Remove cowl top cover. Refer to EI-24, "
COWL TOP" .
4. Remove high-pressure pipe 2 mounting clip.
5. Remove low-pressure flexible hose bracket mounting bolts.
6. Disconnect evaporator-side one touch joint.
a. Set a disconnector (High-pressure side: 92530-89908, Low-
pressure side: 92530-89916) on A/C piping.
b. Slide a disconnector toward vehicle front until it clicks.
c. Slide A/C piping toward vehicle front and disconnect it.
CAUTION:
Seal connection opening of piping with a cap or vinyl tape
to avoid exposure to atmosphere.
7. Remove electronic control throttle assembly (VQ35DE). Refer to
EM-19, "
INTAKE MANIFOLD COLLECTOR" .
8. Disconnect two heater hoses from heater core.
9. Remove instrument panel assembly. Refer to IP-11, "
Removal
and Installation" .
10. Remove blower unit. Refer to ATC-121, "
BLOWER UNIT" .
11. Remove instrument stays (driver side and passenger side).
RJIA2037E
RJIA2041E
RJIA2077E
RJIA2042E

HEATER & COOLING UNIT ASSEMBLY
ATC-127
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Revision: 2004 November 2004 FX35/FX45
12. Remove mounting bolts from heater & cooling unit.
13. Disconnect drain hose.
14. Remove ventilator ducts, defroster nozzle and ducts.
15. Remove steering member mounting bolts, nut and harness clips.
16. Remove the steering member, and then remove heater & cooling unit.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace O-rings for A/C piping with new one, then apply compressor oil to it when installing it.

Connection point for female-side piping is thin. So, when inserting male-side piping, take care not
to deform female-side piping. Slowly insert in axial direction.

Insert one-touch joint connection point securely until it clicks.

After piping has been connected, pull male-side piping by hand to make sure piping does not
come off.

When recharging refrigerant, check for leaks.
NOTE:

When filling radiator with coolant, refer to CO-11, "Changing Engine Coolant" (VQ35DE) or CO-36,
"Changing Engine Coolant" (VK45DE).

Recharge the refrigerant.
RJIA2044E
RJIA2043E
Heater & cooling unit mounting bolt
Tightening torque : 6.8 N·m (0.69 kg-m, 60 in - lb)
Steering member mounting nut and bolt
Tightening torque : 12 N·m (1.2 kg-m, 9 ft - lb)

ATC-128
HEATER & COOLING UNIT ASSEMBLY
Revision: 2004 November 2004 FX35/FX45
Disassembly and AssemblyAJS0015K
1. Heater pipe grommet 2. Heater core 3. Heater pipe cover
4. Aspirator 5. Aspirator hose 6. Air mix door motor (driver side)
7. Air mix door (slide door) 8. Max. cool door link 9. Max. cool door lever
10. Ventilator door lever 11. Ventilator door link 12. Air mix door motor (passenger side)
13. Intake sensor bracket 14. Intake sensor 15. Foot duct (right)
16. Evaporator cover 17. Evaporator cover adaptor 18. Heater pipe bracket
RJIA2045E