Problem Symptoms Table
Before replacing or
repairing air conditioning components, first determine if the malfunction
is due to the refrigerant charge, air flow or compressor.
Use the table below to
help you find the cause of the problem. The numbers indicate the priority
of the likely cause of the problem. Check each part in order. If
necessary, replace these parts.
After correcting the
malfunction, check the complete system to ensure that performance is
satisfactory.
Standard:
Symptom
|
Suspect
Area
|
No
blower operation
|
1. Blower
fuse
|
2. Blower
relay
|
3. Blower
motor
|
4. Power
mosfet
|
5. Blower
speed control switch
|
6. Wire
harness
|
No
air temperature control
|
1. Engine
coolant capacity
|
2. Heater
control assembly
|
No
compressor operation
|
1. Refrigerant
capacity
|
2. A/C
Fuse
|
3. Magnetic
clutch
|
4.
Compressor
|
5. A/C
pressure transducer
|
6. A/C
switch
|
7. Evaporator
temperature sensor
|
8. Wire
harness
|
No
cool comes out
|
1. Refrigerant
capacity
|
2. Refrigerant
pressure
|
3. Drive
belt
|
4. Magnetic
clutch
|
5.
Compressor
|
6. A/C
pressure transducer
|
7. Evaporator
temperature sensor
|
8. A/C
switch
|
9. Heater
control assembly
|
10. Wire
harness
|
Insufficient cooling
|
1. Refrigerant
capacity
|
2. Drive
belt
|
3. Magnetic
clutch
|
4.
Compressor
|
5.
Condenser
|
6. Expansion
valve
|
7.
Evaporator
|
8. Refrigerant
lines
|
9. A/C
pressure transducer
|
10. Heater
control assembly
|
No
engine idle-up when A/C switch ON
|
1. Engine
ECM
|
2. Wire
harness
|
No air inlet
control
|
1. Heater
control assembly
|
No
mode control
|
1. Heater
control assembly
|
2. Mode
actuator
|
No
cooling fan operation
|
1. Cooling fan
fuse
|
2. Fan
motor
|
3. Engine
ECM
|
4. Wire
harness
|
