Nissan Titan A60. Manual — part 602

INSUFFICIENT HEATING

HAC-91

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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INSUFFICIENT HEATING

Component Function Check

INFOID:0000000006164729

SYMPTOM: Insufficient heating

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1. Press the AUTO switch.

2. Turn the temperature control dial (driver) clockwise until 32

°C (90°F) is displayed.

3. Check for hot air at discharge air outlets.
Can this symptom be duplicated?

YES

>> GO TO 2.

NO

>> Perform complete system operational check. Refer to

HAC-6, "Operational Check"

.

2.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 3.

3.

PERFORM SELF-DIAGNOSIS

Perform self-diagnosis. Refer to

HAC-21, "Front Air Control Self-Diagnosis"

.

Is the inspection results normal?

YES

>> GO TO 4.

NO

>> Refer to

HAC-21, "Front Air Control Self-Diagnosis Code Chart"

.

4.

CHECK ENGINE COOLING SYSTEM

1. Check for proper engine coolant level. Refer to

CO-10, "Inspection"

.

2. Check hoses for leaks or kinks.

3. Check radiator cap. Refer to

CO-10, "Inspection"

.

4. Check for air in cooling system.

>> GO TO 5.

5.

CHECK AIR MIX DOOR OPERATION

Check the operation of the air mix door.
Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Check the air mix door motor circuit. Refer to

HAC-28, "Air Mix Door Motor (Driver) Component

Function Check"

.

6.

CHECK AIR DUCTS

Check for disconnected or leaking air ducts.
Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair all disconnected or leaking air ducts.

7.

CHECK HEATER HOSE TEMPERATURES

1. Start engine and warm it up to normal operating temperature.

2. Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be

warm.

Is the inspection result normal?

YES

>> Hot inlet hose and a warm outlet hose: GO TO 8.

NO

>> • Inlet hose cold: GO TO 11.

• Both hoses warm: GO TO 9.

8.

CHECK ENGINE COOLANT SYSTEM

HAC-92

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INSUFFICIENT HEATING

Check engine coolant temperature sensor. Refer to

EC-177, "Component Inspection"

.

Is the inspection result normal?

YES

>> System OK.

NO

>> Repair or replace as necessary. Retest.

9.

CHECK HEATER HOSES

Check heater hoses for proper installation.
Is the inspection result normal?

YES

>> System OK.

NO

>> 1. Back flush heater core.

2. Drain the water from the system.

3. Refill system with new engine coolant. Refer to

CO-11, "Changing Engine Coolant"

.

4. GO TO 10 to retest.

10.

CHECK HEATER HOSE TEMPERATURES

1. Start engine and warm it up to normal operating temperature.

2. Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be

warm.

Is the inspection result normal?

YES

>> System OK.

NO

>> Replace heater core. Refer to

VTL-15, "Removal and Installation"

.

11.

CHECK WATER VALVE

Check the operation of the water valve. Refer to

HAC-54, "Water Valve Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> System OK.

NO

>> Replace water valve.

NOISE

HAC-93

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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NOISE

Component Function Check

INFOID:0000000006164730

SYMPTOM: Noise

INSPECTION FLOW

*1

HAC-6, "Operational Check"

*2

EM-13, "Checking Drive Belts"

*3

HAC-86, "Performance Chart"

*4

HA-43, "Removal and Installation for
Expansion Valve"

*5

HA-33, "Removal and Installation for
Compressor Clutch"

*6

HA-33, "Removal and Installation for
Compressor Clutch"

*7

HA-32, "Removal and Installation for
Compressor"

*8

HA-32, "Removal and Installation for
Compressor"

*9

HA-41, "Removal and Installation for
Condenser"

AWIIA1001GB

HAC-94

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MEMORY FUNCTION DOES NOT OPERATE

MEMORY FUNCTION DOES NOT OPERATE

Memory Function Check

INFOID:0000000006164731

SYMPTOM: Memory function does not operate.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MEMORY FUNCTION

1. Set the temperature to 32

°C (90°F).

2. Rotate the front blower control dial (driver) to turn system OFF.

3. Turn ignition switch OFF.

4. Turn ignition switch ON.

5. Press the AUTO switch.

6. Confirm that the set temperature remains at previous temperature.

7. Press the OFF switch.
Can the symptom be duplicated?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to

HAC-6, "Operational Check"

.

Can a symptom be duplicated?

YES

>> Refer to

HAC-5, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

PERFORM SELF-DIAGNOSIS

Perform self-diagnosis to check for any codes. Refer to

HAC-21, "Front Air Control Self-Diagnosis"

.

Are any self-diagnosis codes present?

YES

>> Refer to

HAC-21, "Front Air Control Self-Diagnosis Code Chart"

.

NO

>> GO TO 5.

5.

CHECK POWER AND GROUND CIRCUIT

Check main power supply and ground circuit. Refer to

HAC-67, "Front Air Control Component Function

Check"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace as necessary.

6.

RECHECK FOR SYMPTOMS

Perform a complete operational check for any symptoms. Refer to

HAC-6, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to

HAC-5, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"

.

NO

>> Replace front air control. Refer to

VTL-8, "Removal and Installation"

.