Nissan Titan. Manual - part 419

DIAGNOSIS AND REPAIR WORKFLOW

HAC-181

< BASIC INSPECTION >

[MANUAL A/C (TYPE 2)]

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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-182, "Operational Check"

. 

>> GO TO 4

4.

GO TO APPROPRIATE TROUBLE DIAGNOSIS

Go to appropriate trouble diagnosis. Refer to 

HAC-243, "Symptom Matrix Chart"

.

>> GO TO 5.

5.

REPAIR OR REPLACE

Repair or replace the specific parts.

>> GO TO 7

6.

FINAL CHECK

Final check.
Is the inspection result normal?

YES

>> Inspection End.

NO

>> GO TO 4

HAC-182

< BASIC INSPECTION >

[MANUAL A/C (TYPE 2)]

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. Rotate the blower control dial clockwise once, blower should operate on low speed.
2. Rotate the blower control dial again, and continue checking blower speed until all speeds are checked.
3. Leave blower on maximum speed. 
If NG, go to trouble diagnosis procedure for 

HAC-212, "Front Blower Motor Diagnosis Procedure"

.

If OK, continue with next check.

CHECKING DISCHARGE AIR

1. Rotate MODE control dial to each position and the DEF

 mode.

2. Confirm that discharge air comes out according to the air distribution table. Refer to 

HAC-191, "Discharge

Air Flow"

.

Mode door position is checked in the next step.

If NG, go to trouble diagnosis procedure for 

HAC-197, "Mode Door Motor Diagnosis Procedure"

.

If OK, continue the check.

NOTE:

Confirm that the 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 ( ,   ONLY)

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-206, "Intake Door Motor Diagnosis Procedure"

.

If OK, continue the check.

NOTE:

Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh
when the DEF or D/F is selected. REC (

) is not allowed in DEF (

) D/F (

) or FOOT (

).

CHECKING TEMPERATURE DECREASE

1. Rotate temperature control dial counterclockwise until maximum cold.
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-244,

"Component Function Check"

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

HAC-202, "Air Mix

Door Motor Diagnosis Procedure"

. 

If OK, continue the check.

CHECKING TEMPERATURE INCREASE

1. Rotate temperature control dial clockwise until maximum hot.
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-252,

"Component Function Check"

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

HAC-202, "Air Mix

Door Motor Diagnosis Procedure"

. 

If OK, continue with next check.

CHECK A/C SWITCH

1. Press A/C switch.
•

Confirm that the compressor clutch engages (sound or visual inspection).

NOTE:

If current mode setting is DEF or D/F, compressor clutch will already be engaged and cannot be turned off.

Conditions

: Engine running and at normal operating temperature

INSPECTION AND ADJUSTMENT

HAC-183

< BASIC INSPECTION >

[MANUAL A/C (TYPE 2)]

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If NG, go to trouble diagnosis procedure for 

HAC-217, "Magnet Clutch Diagnosis Procedure"

.

If all operational checks are OK (symptom cannot be duplicated), go to 

HAC-181, "How to Perform Trouble

Diagnosis For Quick And Accurate Repair"

 and perform tests as outlined. If symptom appears, refer to 

HAC-

243, "Symptom Matrix Chart"

 and perform applicable trouble diagnosis procedures.

HAC-184

< SYSTEM DESCRIPTION >

[MANUAL A/C (TYPE 2)]

MANUAL A/C IDENTIFICATION TABLE

SYSTEM DESCRIPTION

MANUAL A/C IDENTIFICATION TABLE

Application Table

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Manual A/C Type

Description

Visual Identification

Manual A/C (Type 1)

Two Control Dial System

Manual A/C (Type 2)

Three Control Dial System 

[with variable blower control 

(VBC)]

ALIIA0692ZZ

AWIIA0478ZZ