Nissan Titan A60. Manual — part 642

INSUFFICIENT COOLING

HAC-251

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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Low-pressure Side Becomes Negative

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Low-pressure side sometimes be-
comes negative.

• Air conditioning system does

not function and does not cy-
clically cool the compart-
ment air.

• The system constantly func-

tions for a certain period of
time after compressor is
stopped and restarted.

Refrigerant does not discharge
cyclically.
↓
Moisture is frozen at expan-
sion valve outlet and inlet.
↓
Water is mixed with refrigerant.

• Drain water from refrigerant

or replace refrigerant.

• Replace liquid tank.

AC354A

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Low-pressure side becomes nega-
tive.

Liquid tank or front/rear side of
expansion valve

′s pipe is frost-

ed or dewed.

High-pressure side is closed
and refrigerant does not flow.
↓
Expansion valve or liquid tank
is frosted.

Leave the system at rest until
no frost is present. Start it
again to check whether or not
the malfunction is caused by
water or foreign particles.
• If water is the cause, initially

cooling is okay. Then the wa-
ter freezes causing a block-
age. Drain water from
refrigerant or replace refrig-
erant.

• If due to foreign particles, re-

move expansion valve and
remove the particles with dry
and compressed air (not
shop air).

• If either of the above meth-

ods cannot correct the mal-
function, replace expansion
valve.

• Replace liquid tank.
• Check oil for contamination.

AC362A

HAC-252

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

INSUFFICIENT HEATING

INSUFFICIENT HEATING

Component Function Check

INFOID:0000000006164849

SYMPTOM: Insufficient heating

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1. Turn the blower control dial to low speed.

2. Turn the temperature control dial clockwise to maximum heat

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-182, "Operational Check"

.

2.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 3.

3.

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 4.

4.

CHECK AIR MIX DOOR OPERATION

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

YES

>> GO TO 5.

NO

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

HAC-201, "Air Mix Door Motor Component Function

Check"

.

5.

CHECK AIR DUCTS

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

YES

>> GO TO 6.

NO

>> Repair all disconnected or leaking air ducts.

6.

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 7.

NO

>> • Inlet hose cold: GO TO 10.

• Both hoses warm: GO TO 8.

7.

CHECK ENGINE COOLANT SYSTEM

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.

8.

CHECK HEATER HOSES

INSUFFICIENT HEATING

HAC-253

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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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 9 to retest.

9.

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"

.

10.

CHECK WATER VALVE

Check the operation of the water valve. Refer to

HAC-222, "Water Valve Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> System OK.

NO

>> Replace water valve.

HAC-254

< SYMPTOM DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

NOISE

NOISE

Component Function Check

INFOID:0000000006164850

SYMPTOM: Noise

INSPECTION FLOW

*1

HAC-182, "Operational Check"

*2

EM-13, "Checking Drive Belts"

*3

HAC-247, "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-20, "Maintenance of Oil Quantity
in Compressor"

*9

HA-41, "Removal and Installation for
Condenser"

AWIIA1001GB