cooling INFINITI M35 2007 Factory Owner's Manual

TROUBLE DIAGNOSIS
ATC-115
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Revision: 2007 April2007 M35/M45
In-vehicle Sensor CircuitNJS000H1
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.
RJIA4092E
RJIA4093E
RJIA1804E

TROUBLE DIAGNOSIS
ATC-121
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Revision: 2007 April2007 M35/M45
Intake Sensor CircuitNJS000H3
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 M82
terminal 1 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 M82
terminal 2 and unified meter and A/C amp. harness connector
M65 terminal 59.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
RJIA4103E
RJIA4104E
1 – Ground : Approx. 5 V
RJIA4215E
2 – 59 : Continuity should exist.
RJIA4106E

ATC-134
HEATER & COOLING UNIT ASSEMBLY
Revision: 2007 April2007 M35/M45
HEATER & COOLING UNIT ASSEMBLYPFP:27110
Removal and InstallationNJS000HF
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-40,
"Changing Engine Coolant" (VK45DE).
3. Remove cowl top cover. Refer to EI-18, "
COWL TOP" .
4. Disconnect low-pressure flexible hose and high-pressure pipe 1
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 flexible hose, low-
pressure pipe 1 and high-pressure pipe 1, 2 with suitable
material such as vinyl tape to avoid the entry of air.
5. Remove electric throttle control actuator. Refer to EM-21,
"INTAKE MANIFOLD COLLECTOR" (VQ35DE) or EM-179, "INTAKE MANIFOLD" (VK45DE).
6. Disconnect two heater hoses from heater core.
7. Remove instrument panel & pad. Refer to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
8. Remove blower unit. Refer to ATC-129, "
BLOWER UNIT" .
9. Remove clips of vehicle harness from steering member.
10. Remove mounting nuts and bolts, and then remove instrument stays.
RJIA4117E
RJIA4118E
RJIA4119E

HEATER & COOLING UNIT ASSEMBLY
ATC-135
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Revision: 2007 April2007 M35/M45
11. Disconnect drain hose.
12. Remove mounting bolts from heater & cooling unit.
13. Remove side defroster nozzles.
14. Remove steering column assembly mounting bolts and nut.
15. Remove steering member mounting bolts.
16. Remove steering member, and then remove heater & cooling unit.
INSTALLATION
Installation is basically the reverse order of removal.
RJIA4180E
RJIA4120E
SJIA1795E

ATC-136
HEATER & COOLING UNIT ASSEMBLY
Revision: 2007 April2007 M35/M45
CAUTION:

Replace O-rings of low-pressure flexible hose and high-pressure pipe 1 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.

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-40,
"Changing Engine Coolant" (VK45DE).

Recharge the refrigerant.
Heater & cooling unit assembly mounting bolt
: 6.9 N·m (0.7 kg-m, 61 in-lb)
Instrument stay mounting nut and bolt
: 12 N·m (1.25 kg-m, 9 ft-lb)

HEATER & COOLING UNIT ASSEMBLY
ATC-137
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Revision: 2007 April2007 M35/M45
Disassembly and AssemblyNJS000HG
1. Aspirator 2. Aspirator hose 3. Front heater duct (left)
4. Foot duct (left) 5. Ventilator door (left) 6. Ventilator door (right)
7. Foot duct (right) 8. Main link sub (right) 9. Ventilator door lever (right)
10. Ventilator door link (right) 11. Main link (right) 12. Mode door motor (passenger side)
13. Max. cool door link (right) 14. Air mix door motor (passenger side) 15. Intake sensor
16. Intake sensor bracket 17. O-ring 18. Low-pressure pipe 1
19. High-pressure pipe 2 20. Expansion valve 21. Cooler pipe grommet
22. Insulator 23. Evaporator cover adapter 24. Air mix door (Slide door)
25. Clip 26. Heater & cooling unit case (left) 27. Heater pipe grommet
28. Heater core 29. Upper ventilator door motor 30. Air mix door motor (driver side)
31. Mode door motor (driver side) 32. Main link (left) 33. Main link sub (left)
34. Ventilator door lever (left) 35. Center case 36. Max. cool door lever (right)
SJIA1772E

ATC-138
HEATER & COOLING UNIT ASSEMBLY
Revision: 2007 April2007 M35/M45
37. Evaporator cover 38. Evaporator 39. Heater & cooling unit case (right)
40. Upper ventilator door 41. Heater pipe cover 42. Upper ventilator door rod
43. Upper ventilator door lever 44. Defroster door link 45. Ventilator door link (left)
46. Max. cool door lever (left) 47. Max. cool door (left) 48. Max. cool door (right)
49. Defroster door (right) 50. Defroster door (left) 51. Max. cool door link (left)
52. Defroster door lever
: N·m (kg-m, in-lb)
: Always replace after every disassembly.

MODE DOOR MOTOR
ATC-139
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Revision: 2007 April2007 M35/M45
MODE DOOR MOTORPFP:27731
Removal and InstallationNJS000HH
REMOVAL
Driver Side
1. Remove heater & cooling unit assembly. Refer to ATC-134, "HEATER & COOLING UNIT ASSEMBLY" .
2. Remove mounting screws, and then remove mode door motor.
3. Disconnect mode door motor connector.
Passenger Side
1. Remove blower unit. Refer to ATC-129, "BLOWER UNIT" .
2. Remove mounting screws, and then remove mode door motor.
3. Disconnect mode door motor connector.
INSTALLATION
Installation is basically the reverse order of removal.
RJIA4124E
RJIA4123E

ATC-140
AIR MIX DOOR MOTOR
Revision: 2007 April2007 M35/M45
AIR MIX DOOR MOTOR PFP:27732
Removal and InstallationNJS000HI
REMOVAL
Driver Side
1. Set the temperature control switch (driver side) at 18°C (60°F), and then disconnect the battery cable from
the negative terminal.
2. Remove heater & cooling unit assembly. Refer to ATC-134, "
HEATER & COOLING UNIT ASSEMBLY" .
3. Remove mounting screws, and then remove air mix door motor.
4. Disconnect air mix door motor connector.
Passenger Side
1. Set the temperature control switch (passenger side) at 18°C (60°F), and then disconnect the battery cable
from the negative terminal.
2. Remove blower unit. Refer to ATC-129, "
BLOWER UNIT" .
3. Remove mounting screws, and then remove air mix door motor.
4. Disconnect air mix door motor connector.
INSTALLATION
Installation is basically the reverse order of removal.
RJIA4126E
RJIA4125E

UPPER VENTILATOR DOOR MOTOR
ATC-141
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Revision: 2007 April2007 M35/M45
UPPER VENTILATOR DOOR MOTORPFP:27731
Removal and InstallationNJS000HJ
REMOVAL
1. Remove heater & cooling unit assembly. Refer to ATC-134, "HEATER & COOLING UNIT ASSEMBLY" .
2. Remove mounting screws.
3. Disconnect upper ventilator door motor connector.
4. Disconnect upper ventilator door rod, and then remove upper
ventilator door motor.
INSTALLATION
Installation is basically the reverse order of removal.
RJIA4127E