Nissan Xterra. Manual — part 451
HAC-2
AIR CONDITIONER CONTROL . . . . . .
Front Air Control Terminals Reference Values . ...
WIRING DIAGRAM . . . . . . . . . .
AIR CONDITIONER CONTROL . . . . . .
Wiring Diagram . . . . . . . . . . . . . ...
SYMPTOM DIAGNOSIS . . . . . . . .
AIR CONDITIONER CONTROL . . . . . .
Symptom Matrix Chart . . . . . . . . . . ..
INSUFFICIENT COOLING . . . . . . . . .
Component Function Check . . . . . . . . ...
Diagnostic Work Flow . . . . . . . . . . . .
Performance Chart . . . . . . . . . . . . .
Trouble Diagnoses for Abnormal Pressure . . . .
INSUFFICIENT HEATING . . . . . . . . .
Component Function Check . . . . . . . . ...
NOISE . . . . . . . . . . . . . . . .
Component Function Check . . . . . . . . ...
PRECAUTION . . . . . . . . . . .
PRECAUTIONS . . . . . . . . . . . . .
Working with HFC-134a (R-134a) . . . . . . ...
DIAGNOSIS AND REPAIR WORKFLOW
HAC-3
< BASIC INSPECTION >
[MANUAL AIR CONDITIONER]
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
How to Perform Trouble Diagnosis For Quick And Accurate Repair
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WORK FLOW
1.
LISTEN TO CUSTOMER COMPLAINT
Listen to customer complaint. Get detailed information about the conditions and environment when the symp-
tom occurs.
>> GO TO 2
2.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 3.
3.
VERIFY THE SYMPTOM WITH OPERATIONAL CHECK
Verify the symptom with operational check. Refer to
.
Can a symptom be duplicated?
YES
>> Go to trouble diagnosis. Refer to
HAC-52, "Symptom Matrix Chart"
NO
>> GO TO 4.
4.
PERFORM THE FRONT AIR CONTROL SELF-DIAGNOSIS
Perform front air control self-diagnosis. Refer to
HAC-16, "Front Air Control Self-Diagnosis"
>> If any diagnostic trouble codes set. Refer to
HAC-16, "Front Air Control Self-Diagnosis Chart"
>> Confirm the repair by performing operational check. Refer to
.
HAC-4
< BASIC INSPECTION >
[MANUAL AIR CONDITIONER]
INSPECTION AND ADJUSTMENT
INSPECTION AND ADJUSTMENT
Operational Check
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The purpose of the operational check is to confirm that the system operates properly.
CHECKING BLOWER
1. Turn blower control all the way counter-clockwise, and then turn the dial one detent clockwise. Blower
should operate on low speed.
2. Turn the blower control dial clockwise again, and continue checking each blower speed until all speeds
are checked.
3. Leave blower on HI speed.
If NG, go to trouble diagnosis procedure for
HAC-28, "Front Blower Motor Diagnosis Procedure"
.
If OK, continue with next check.
CHECK A/C SWITCH
1. Press A/C switch with blower switch ON.
2. A/C switch indicator will turn ON.
• Confirm that the compressor clutch engages (sound or visual inspection).
If NG, go to trouble diagnosis procedure for
HAC-33, "Magnet Clutch Diagnosis Procedure"
.
If OK, continue with next check.
CHECKING DISCHARGE AIR
Press each mode switch and confirm that discharge air comes out according to the air distribution table. Refer
.
If NG, go to trouble diagnosis procedure for
HAC-18, "Mode Door Motor Diagnosis Procedure"
If OK, continue with next check.
NOTE:
Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and intake door position is at
fresh when the DEF (
) or D/F (
) is selected.
CHECKING RECIRCULATION
1. Press recirculation (
) switch one time. Recirculation indicator should illuminate.
2. Press recirculation (
) switch one more time. Recirculation indicator should go off.
3. Listen for intake door position change (blower sound should change slightly).
If NG, go to trouble diagnosis procedure for
HAC-26, "Intake Door Motor Diagnosis Procedure"
.
If OK, continue with next check.
NOTE:
Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and intake door position is at
fresh when the DEF (
) or D/F (
) is selected.
CHECKING TEMPERATURE DECREASE
1. Rotate temperature control dial counterclockwise.
2. Check for cold air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation if OK, go to trouble diagnosis procedure for
. If air mix door motor appears to be malfunctioning, go to
Motor Component Function Check"
If OK, continue with next check.
CHECKING TEMPERATURE INCREASE
1. Rotate temperature control dial clockwise.
2. Check for hot air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for
. If air mix door motor (front) appears to be malfunctioning, go to
Mix Door Motor Component Function Check"
.
If OK, continue with next check.
Conditions
: Engine running and at normal operating temperature
FUNCTION INFORMATION
HAC-5
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONER]
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SYSTEM DESCRIPTION
FUNCTION INFORMATION
Component Part Location
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ENGINE COMPARTMENT
WJIA1489E
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