Nissan Xterra. Manual - part 451

HAC-2

AIR CONDITIONER CONTROL  ........................

43

Front Air Control Terminals Reference Values  .......

43

WIRING DIAGRAM  .....................................

45

AIR CONDITIONER CONTROL  ........................

45

Wiring Diagram  .......................................................

45

SYMPTOM DIAGNOSIS  .............................

52

AIR CONDITIONER CONTROL  ........................

52

Symptom Matrix Chart ..........................................

52

INSUFFICIENT COOLING .................................

53

Component Function Check  ...................................

53

Diagnostic Work Flow .............................................

54

Performance Chart  .................................................

56

Trouble Diagnoses for Abnormal Pressure .............

57

INSUFFICIENT HEATING  .................................

61

Component Function Check  ...................................

61

NOISE ................................................................

63

Component Function Check  ...................................

63

PRECAUTION ............................................

65

PRECAUTIONS  .................................................

65

Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................

65

Working with HFC-134a (R-134a) ...........................

65

Precaution for Service Equipment ..........................

66

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 

HAC-4, "Operational Check"

. 

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, "Operational Check"

.

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

tot 

HAC-11, "Discharge Air Flow"

.

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 

HAC-53,

"Component Function Check"

. If air mix door motor appears to be malfunctioning, go to 

HAC-22, "Air Mix Door

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 

HAC-61,

"Component Function Check"

. If air mix door motor (front) appears to be malfunctioning, go to 

HAC-22, "Air

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