Nissan Titan A60. Manual - part 640

AIR CONDITIONER CONTROL

HAC-243

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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AIR CONDITIONER CONTROL

Symptom Matrix Chart

INFOID:0000000006164844

SYMPTOM TABLE

Symptom

Reference Page

A/C system does not come on.

Go to Trouble Diagnosis Procedure for A/C System.

HAC-227

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor.

HAC-197

Mode door motor is malfunctioning.

Discharge air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor.

HAC-201

Air mix door motor is malfunctioning.

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor.

HAC-205

Intake door motor is malfunctioning.

Defroster door motor is malfunctioning.

Go to Trouble Diagnosis Procedure for Defroster Door Motor.

HAC-207

Front blower motor operation is malfunction-
ing.

Go to Trouble Diagnosis Procedure for Front Blower Motor.

HAC-211

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-217

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-244

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-252

Noise

Go to Trouble Diagnosis Procedure for Noise.

HAC-254

HAC-244

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

INSUFFICIENT COOLING

INSUFFICIENT COOLING

Component Function Check

INFOID:0000000006164845

SYMPTOM: Insufficient cooling

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE 

1. Rotate the blower control dial to the low speed.

2. Turn temperature control dial counterclockwise to maximum cold.

3. Check for cold air at discharge air outlets.
Can the symptom be duplicated?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FOR ANY SYMPTOMS 

Perform a complete operational check for any symptoms. Refer to 

HAC-182, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to 

HAC-243, "Symptom Matrix Chart"

. 

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

CHECK DRIVE BELTS 

Check compressor belt tension. Refer to 

EM-13, "Checking Drive Belts"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Adjust or replace compressor belt. Refer to 

EM-13, "Removal and Installation"

.

5.

CHECK AIR MIX DOOR OPERATION

Check and verify air mix door mechanism for smooth operation. Refer to 

HAC-201, "Air Mix Door Motor Com-

ponent Function Check"

.

Does air mix door operate correctly?

YES

>> GO TO 6.

NO

>> Check air mix door motor circuit. Refer to 

HAC-202, "Air Mix Door Motor Diagnosis Procedure"

.

6.

CHECK COOLING FAN MOTOR OPERATION

Check and verify cooling fan motor for smooth operation. Refer to 

EC-439, "Component Inspection"

.

Does cooling fan motor operate correctly?

YES

>> GO TO 7.

NO

>> Check cooling fan motor. Refer to 

EC-439, "Diagnosis Procedure"

.

7.

CHECK WATER VALVE OPERATION

Check and verify water valve for smooth operation. Refer to 

HAC-222, "Description"

.

Does water valve operate correctly?

YES

>> GO TO 8.

NO

>> Check water valve circuit. Refer to 

HAC-222, "Water Valve Diagnosis Procedure"

.

8.

CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE

Check recovery/recycling equipment before connecting to vehicle. Verify there is no pressure in the recovery/

recycling equipment by checking the gauges. If pressure exists, recover refrigerant from equipment lines.

>> GO TO 9.

INSUFFICIENT COOLING

HAC-245

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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9.

CHECK REFRIGERANT PURITY

1. Connect recovery/recycling equipment to vehicle.

2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.
Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Check contaminated refrigerant. Refer to 

HAC-255, "Working with HFC-134a (R-134a)"

.

10.

CHECK FOR EVAPORATOR FREEZE UP

Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?

YES

>> Perform performance test diagnoses. Refer to 

HAC-245, "Diagnostic Work Flow"

.

NO

>> GO TO 11.

11.

CHECK REFRIGERANT PRESSURE

Check refrigerant pressure with manifold gauge connected. Refer to 

HAC-247, "Performance Chart"

. 

Is the inspection result normal?

YES

>> Perform performance test diagnoses. Refer to 

HAC-245, "Diagnostic Work Flow"

.

NO

>> GO TO 12.

12.

CHECK AIR DUCTS

Check ducts for air leaks.
Is the inspection result normal?

YES

>> System OK.

NO

>> Repair air leaks.

Diagnostic Work Flow

INFOID:0000000006164846

HAC-246

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

INSUFFICIENT COOLING

*1

HA-24, "Checking System for Leaks 
Using the Fluorescent Dye Leak De-
tector"

*2

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

*3

HAC-247, "Performance Chart"

*4

HAC-248, "Trouble Diagnoses for 
Abnormal Pressure"

*5

HAC-201, "Air Mix Door Motor Com-
ponent Function Check"

AWIIA0999GB