Nissan Titan A60. Manual — part 621

INSUFFICIENT COOLING

HAC-167

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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INSUFFICIENT COOLING

Component Function Check

INFOID:0000000006164789

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-99, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to

HAC-166, "Symptom Matrix Chart"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> If equipped with NAVI, GO TO 4.

>> If not equipped with NAVI, GO TO 5.

4.

PERFORM SELF-DIAGNOSIS

Perform self-diagnosis Refer to

HAC-114, "Front Air Control Self-Diagnosis"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Refer to

HAC-166, "Symptom Matrix Chart"

.

5.

CHECK DRIVE BELTS

Check compressor belt tension. Refer to

EM-13, "Checking Drive Belts"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Adjust or replace compressor belt. Refer to

EM-13, "Removal and Installation"

.

6.

CHECK AIR MIX DOOR OPERATION

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

HAC-120, "Air Mix Door Motor Com-

ponent Function Check"

.

Does air mix door operate correctly?

YES

>> GO TO 7.

NO

>> Check air mix door motor circuit. Refer to

HAC-121, "Air Mix Door Motor Diagnosis Procedure"

.

7.

CHECK COOLING FAN MOTOR OPERATION

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

EC-358, "Overall Function Check"

.

Does cooling fan motor operate correctly?

YES

>> GO TO 8.

NO

>> Check cooling fan motor. Refer to

EC-359, "Diagnosis Procedure"

.

8.

CHECK WATER VALVE OPERATION

Check and verify water valve for smooth operation. Refer to

HAC-142, "Description"

.

Does water valve operate correctly?

YES

>> GO TO 9.

HAC-168

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

INSUFFICIENT COOLING

NO

>> Check water valve circuit. Refer to

HAC-142, "Water Valve Diagnosis Procedure"

.

9.

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 10.

10.

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 11.

NO

>> Check contaminated refrigerant. Refer to

HAC-178, "Working with HFC-134a (R-134a)"

.

11.

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-168, "Diagnostic Work Flow"

.

NO

>> GO TO 12.

12.

CHECK REFRIGERANT PRESSURE

Check refrigerant pressure with manifold gauge connected. Refer to

HAC-170, "Performance Chart"

.

Is the inspection result normal?

YES

>> Perform performance test diagnoses. Refer to

HAC-168, "Diagnostic Work Flow"

.

NO

>> GO TO 13.

13.

CHECK AIR DUCTS

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

YES

>> System OK.

NO

>> Repair air leaks.

Diagnostic Work Flow

INFOID:0000000006164790

INSUFFICIENT COOLING

HAC-169

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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*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-170, "Performance Chart"

*4

HAC-171, "Trouble Diagnoses for
Abnormal Pressure"

*5

HAC-120, "Air Mix Door Motor Com-
ponent Function Check"

AWIIA0999GB

HAC-170

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

INSUFFICIENT COOLING

Performance Chart

INFOID:0000000006164791

TEST CONDITION

Testing must be performed as follows:

*1

VTL-12, "Removal and Installation"

*2

HAC-131, "Front Blower Motor Com-
ponent Function Check"

*3

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

*4

EM-13, "Checking Drive Belts"

*5

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

AWIIA1000GB