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
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
2. Check hoses for leaks or kinks.
3. Check radiator cap. Refer to
.
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
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