heater INFINITI FX35 2007 Service Manual

ATC-3
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Revision: 2006 July 2007 FX35/FX45
COMPONENT INSPECTION ...........................
. . 111
Intake Sensor Circuit ........................................... .. 112
COMPONENT DESCRIPTION ........................ .. 112
DIAGNOSIS PROCEDURE FOR INTAKE SEN-
SOR ................................................................. .. 112
COMPONENT INSPECTION ........................... .. 113
CONTROLLER ...................................................... ..114
Removal and Installation of A/C and AV Switch .. .. 114
REMOVAL ........................................................ .. 114
INSTALLATION ................................................ .. 114
AUTO AMP ............................................................ ..115
Removal and Installation of Unified Meter and A/C
Amp. .................................................................... .. 115
REMOVAL ........................................................ .. 115
INSTALLATION ................................................ .. 115
AMBIENT SENSOR ............................................... ..116
Removal and Installation ..................................... .. 116
REMOVAL ........................................................ .. 116
INSTALLATION ................................................ .. 116
IN-VEHICLE SENSOR ........................................... ..117
Removal and Installation ..................................... .. 117
REMOVAL ........................................................ .. 117
INSTALLATION ................................................ .. 117
SUNLOAD SENSOR ............................................. ..118
Removal and Installation ..................................... .. 118
REMOVAL ........................................................ .. 118
INSTALLATION ................................................ .. 118
INTAKE SENSOR .................................................. ..119
Removal and Installation ..................................... .. 119
REMOVAL ........................................................ .. 119
INSTALLATION ................................................ .. 119
BLOWER UNIT ...................................................... . 120
Removal and Installation ..................................... . 120
REMOVAL ........................................................ . 120
INSTALLATION ................................................ . 120
Disassembly and Assembly ................................ . 121
BLOWER MOTOR ................................................. . 122
Removal and Installation ..................................... . 122
REMOVAL ........................................................ . 122
INSTALLATION ................................................ . 122
INTAKE DOOR MOTOR ........................................ . 123
Removal and Installation ..................................... . 123
REMOVAL ........................................................ . 123
INSTALLATION ................................................ . 123
IN-CABIN MICROFILTER ...................................... . 124
Removal and Installation ..................................... . 124
FUNCTION ....................................................... . 124
REPLACEMENT TIMING ................................. . 124
REPLACEMENT PROCEDURES .................... . 124
HEATER & COOLING UNIT ASSEMBLY ............. . 125
Removal and Installation ..................................... . 125
REMOVAL ........................................................ . 125
INSTALLATION ................................................ . 126
Disassembly and Assembly ................................ . 128
MODE DOOR MOTOR .......................................... . 130
Removal and Installation ..................................... . 130
REMOVAL ........................................................ . 130
INSTALLATION ................................................ . 130 AIR 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
COMPONENT LAYOUT ................................... .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
VQ35DE ........................................................... .139
VK45DE ............................................................ .140
Removal and Installation of Compressor ............. .140
REMOVAL ........................................................ .140
INSTALLATION ................................................ .142
Removal and Installation of Compressor Clutch . .142
REMOVAL ........................................................ .142
INSTALLATION ................................................ .144
Removal and Installation of Low-pressure Flexible
Hose .................................................................... .146
REMOVAL ........................................................ .146
INSTALLATION ................................................ .147
Removal and Installation of High-pressure Flexible
Hose .................................................................... .147
REMOVAL ........................................................ .147
INSTALLATION ................................................ .148
Removal and Installation of Low-pressure Pipe 1
(Engine Compartment) ........................................ .148
REMOVAL ........................................................ .148
INSTALLATION ................................................ .149
Removal and Installation of High-pressure Pipe 1
and 2 (Engine Compartment) .............................. .149
REMOVAL ........................................................ .149
INSTALLATION ................................................ .150
Removal and Installation of Low-pressure Pipe 2
and High-pressure Pipe 3 .................................... .150
REMOVAL ........................................................ .150
INSTALLATION ................................................ .151
Removal and Installation of Liquid Tank .............. .152
REMOVAL ........................................................ .152
INSTALLATION ................................................ .152
Removal and Installation of Condenser ............... .153
REMOVAL ........................................................ .153
INSTALLATION ................................................ .154
Removal and Installation of Refrigerant Pressure
Sensor ................................................................. .154
REMOVAL ........................................................ .154
INSTALLATION ................................................ .154
Removal and Installation of Evaporator ............... .154
REMOVAL ........................................................ .154
INSTALLATION ................................................ .155

ATC-70
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit assem-
bly. It rotates so that air is discharged from the outlet set by the uni-
fied meter and A/C amp. Motor rotation is conveyed to a link which
activates the mode door.
DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnosis procedure. Refer to AT C - 6 4 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA1778E
RJIA0890E

TROUBLE DIAGNOSIS ATC-73
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COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motors are attached to the heater & cooling unit
assembly. 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 then
conveyed through a shaft and the air mix door position feedback is
then sent to the unified meter and A/C amp. by PBR built-in air mix
door motor.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to AT C - 6 4 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
Air Mix Door Motor PBR CircuitNJS000E6
SYMPTOM

Discharge air temperature does not change.

PBR circuit is open or shorted.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR
Perform diagnosis procedure. Refer to AT C - 6 4 , "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA0893E
RJIA0894E

ATC-106
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
In-vehicle Sensor CircuitNJS000EG
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
assembly. It produces vacuum pressure due to air discharged from
the heater & cooling unit assembly, continuously taking compartment
air in the aspirator.
RJIA2021E
RJIA0921E
RJIA1804E

ATC-112
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
Intake Sensor CircuitNJS000EI
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit assembly. It
converts temperature of air after it passes through the evaporator
into a resistance value which is then input to the unified meter and A/
C amp.
DIAGNOSIS 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 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 and unified meter and A/C amp. harness con-
nector M57 terminal 49.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
RJIA0928E
RJIA1458E
2 – Ground : Approx. 5 V
RJIA2031E
1 – 49 : Continuity should exist.
RJIA2032E

HEATER & COOLING UNIT ASSEMBLY ATC-125
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Revision: 2006 July 2007 FX35/FX45
HEATER & COOLING UNIT ASSEMBLYPFP:27110
Removal and InstallationNJS000EU
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Drain coolant from cooling system. Refer to CO-11, "
Changing Engine Coolant" (VQ35DE) or CO-38,
"Changing Engine Coolant" (VK45DE).
3. Remove cowl top cover. Refer to EI-23, "
COWL TOP" .
4. Remove high-pressure pipe 2 mounting clip.
5. Remove low-pressure flexible hose bracket mounting bolt. Refer to ATC-146, "
Removal and Installation of
Low-pressure Flexible Hose" .
6. Disconnect low-pressure pipe 1 and high-pressure pipe 2 from evaporator.
a. Set a disconnector [high-pressure side (SST: 9253089908), low- pressure side (SST: 9253089916)] 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:
Cap or wrap the joint of low-pressure pipe 1, 2 and high-
pressure pipe 2, 3 with suitable material such as vinyl tape
to avoid the entry of air.
7. Remove electric throttle control actuator (VQ35DE). Refer to EM-19, "
INTAKE MANIFOLD COLLECTOR" .
8. Disconnect two heater hoses from heater core.
9. Remove instrument panel and pad. Refer to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
10. Remove blower unit. Refer to ATC-120, "
BLOWER UNIT" .
RJIA2037E
RJIA2077E
RJIA2041E

ATC-126
HEATER & COOLING UNIT ASSEMBLY
Revision: 2006 July 2007 FX35/FX45
11. Remove mounting nuts and bolts, and then remove instrument stays (left and right side).
12. Remove mounting bolts from heater & cooling unit assembly.
13. Disconnect drain hose.
14. Remove center and side ventilator ducts, defroster nozzle and side defroster ducts. Refer to ATC-134,
"Removal of Defroster Nozzle, Ducts and Ventilator Ducts" .
15. Remove steering column mounting bolts and nut.
16. Remove steering member mounting bolts, nut and harness clips.
17. Remove steering member, and then remove heater & cooling unit assembly.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace O-rings of low-pressure pipe 1 and high-pressure pipe 2 with new ones, and then apply
compressor oil to it when installing it.

Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.
RJIA2042E
SJIA1223E
SJIA1656E

HEATER & COOLING UNIT ASSEMBLY ATC-127
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Revision: 2006 July 2007 FX35/FX45

Insert piping securely until a click is heard.

After piping connection is completed, pull male-side piping by hand to make sure that connection
does not come loose.

When recharging refrigerant, check for leaks.
NOTE:

When filling radiator with coolant, refer to CO-11, "Changing Engine Coolant" (VQ35DE) or CO-38,
"Changing Engine Coolant" (VK45DE).

Recharge the refrigerant.
Heater & cooling unit assembly mounting bolt : 6.8 N·m (0.69 kg-m, 60 in-lb)
Steering member mounting nut and bolt : 12 N·m (1.2 kg-m, 9 fl-lb)
Steering column mounting nut and bolt : 16.7 N·m (1.7 kg-m, 12 fl-lb)

ATC-128
HEATER & COOLING UNIT ASSEMBLY
Revision: 2006 July 2007 FX35/FX45
Disassembly and AssemblyNJS000EV
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
PJIA0157E

HEATER & COOLING UNIT ASSEMBLY ATC-129
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Revision: 2006 July 2007 FX35/FX45
19. Insulator 20. Heater case (right) 21. Low-pressure pipe 2
22. O-ring 23. High-pressure pipe 3 24. Expansion valve
25. Evaporator 26. Heater case (left) 27. Foot duct (left)
28. Center case 29. Max. cool door (left) 30. Ventilator door
31. Side link 32. Mode door motor 33. Defroster door
34. Max. cool door (right) 35. Defroster door lever 36. Defroster door link
: N·m (kg-m, in-lb)
: Always replace after every disassembly.