Nissan Frontier. Instruction — part 899
HAC-150
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
INSUFFICIENT COOLING
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
INSUFFICIENT HEATING
HAC-151
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
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HAC
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INSUFFICIENT HEATING
Component Function Check
INFOID:0000000009478366
SYMPTOM: Insufficient heating
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Rotate blower control dial clockwise.
2. Turn the temperature control dial clockwise to maximum heat.
3. Check for hot air at discharge air outlets.
Can the symptom be duplicated?
YES
>> GO TO 2.
NO
>> Perform complete operational check. Refer to
.
2.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 3.
3.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis. Refer to
HAC-101, "Front Air Control Self-Diagnosis"
.
Is the inspection results normal?
YES
>> GO TO 4.
NO
>> Refer to
HAC-142, "Symptom Matrix Chart"
4.
CHECK ENGINE COOLING SYSTEM
1. Check for proper engine coolant level. Refer to
(VQ40DE).
2. Check hoses for leaks or kinks.
3. Check radiator cap. Refer to
(VQ40DE).
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-108, "Air Mix Door Motor Component Function
.
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
>> Both hoses warm: GO TO 9.
HAC-152
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
INSUFFICIENT HEATING
8.
CHECK ENGINE COOLANT SYSTEM
Check engine coolant temperature sensor. Refer to
EC-183, "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-12, "Changing Engine Coolant"
(QR25DE) or
CO-40, "Changing Engine Coolant"
(VQ40DE).
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
NOISE
HAC-153
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
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HAC
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NOISE
Component Function Check
INFOID:0000000009478367
SYMPTOM: Noise
INSPECTION FLOW
AWIIA1001GB
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