2005 NISSAN X-TRAIL heater

ATC-78
TROUBLE DIAGNOSIS

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 auto amp. The air mix door position is fed back to the auto
amp. by PBR built-in air mix door motor.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnostic procedure. Refer to AT C - 6 9 , "
DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
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TROUBLE DIAGNOSIS
ATC-111
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AT C

COMPONENT INSPECTION
Ambient Sensor
After disconnecting ambient sensor connector E38, measure resis-
tance between terminals 2 and 1 at sensor side, using the table
below.
If NG, replace ambient sensor.
In-Vehicle Sensor CircuitEJS004YQ
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 auto
amp.
Aspirator
The aspirator is located on front side of heater & cooling unit. It pro-
duces vacuum pressure due to air discharged from the heater &
cooling unit, continuously taking compartment air in the aspirator.
Temperature °C (°F) Resistance kΩ
−15 (5) 12.73
−10 (14) 9.92
−5 (23) 7.80
0 (32) 6.19
5 (41) 4.95
10 (50) 3.99
15 (59) 3.24
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
45 (113) 1.07
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RJIA0557E

TROUBLE DIAGNOSIS
ATC-117
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Intake Sensor CircuitEJS004L6
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 auto amp.
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted.
LED of A/C switch does not illuminate 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 M68 (Gasoline engine) or M69 (Diesel engine)
terminal 1 (BR/Y) and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
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1 – Ground : Approx. 5V
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HEATER & COOLING UNIT ASSEMBLY
ATC-131
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HEATER & COOLING UNIT ASSEMBLYPFP:27110
Removal and InstallationEJS000UT
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge refrigerant.
2. Drain coolant from cooling system. Refer to CO-9, "
Changing Engine Coolant" for QR engine or CO-32,
"Changing Engine Coolant" for YD engine.
3. Disconnect two heater hoses from heater core pipe.
4. Remove mounting bolt from low-pressure flexible hose.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such
as vinyl tape to avoid the entry of air.
5. Remove the blower unit. Refer to ATC-125, "
BLOWER UNIT" .
6. Remove clips of vehicle harness from steering member.
7. Remove mounting nuts, and then remove instrument stay.
8. Remove mounting bolts from heater & cooling unit.
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RJIA0061E
RJIA2444E

ATC-132
HEATER & COOLING UNIT ASSEMBLY

9. Remove steering member.
10. Remove heater & cooling unit.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace the O-ring of the low-pressure flexible hose and the high-pressure pipe with a new one,
and then apply compressor oil to it when installing it.

When recharging refrigerant, check for leaks.
NOTE:
When filling radiator with coolant, refer to CO-9, "
Changing Engine Coolant" for QR engine or CO-32, "Chang-
ing Engine Coolant" for YD engine.
Disassembly and AssemblyEJS000UU
NOTE:
This illustration is for RHD models. The layout for LHD models is symmetrically opposite.
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HEATER & COOLING UNIT ASSEMBLY
ATC-133
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1. Cooler grommet 2. Screw 3. Heater pipe support
4. Screw 5. Expansion valve cover 6. Bolt
7. Expansion valve 8. Insulator 9. Evaporator
10. Slide door unit (Air mix door) 11. Evaporator cover 12. Screw
13. Screw 14. Air mix door motor 15. mode door motor
16. Screw 17. Ventilator door link 1 18. Ventilator door link 2
19. Ventilator door lever 20. Rod 21. Rod holder
22. Main link 23. Max. cool door lever 24. Defroster door lever
25. Screw 26. Foot duct (right) 27. Heater core
28. Heater core cover 29. Foot duct (left) 30. Intake sensor bracket
31. Intake sensor 32. Screw 33. Aspirator
34. Screw 35. Heater & cooling unit case (right) 36. Defroster door
37. Ventilator door 38. Max. cool door 39. Heater & cooling unit case (left)
RJIA0064J

ATC-136
HEATER CORE

HEATER COREPFP:27140
Removal and InstallationEJS004GJ
REMOVAL
1. Remove heater & cooling unit. Refer to ATC-131, "HEATER & COOLING UNIT ASSEMBLY" .
2. Remove heater pipe support.
3. Remove mounting screws, and then remove foot duct and
heater core cover.
4. Remove heater core from heater & cooling unit.
INSTALLATION
Installation is basically the reverse order of removal.
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DUCTS AND GRILLES
ATC-139
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Removal of Adaptor
1. Remove heater & cooling unit. Refer to ATC-131, "HEATER & COOLING UNIT ASSEMBLY" .
2. Remove mounting screw and clip.
3. Slide adaptor toward vehicle front, and then remove adaptor.
Removal of Multi-box Duct
1. Remove instrument panel. Refer to IP-11, "Removal and Installation" .
2. Remove mounting screws, and then disconnect multi-box duct
from heater & cooling unit.
3. Remove mounting bolts, and then remove heater & cooling unit
bracket.
4. Remove multi-box duct from left side.
Removal of Foot Duct
1. Remove multi-box duct.
2. Remove mounting screws, and then remove foot duct.
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