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.
Symptom
|
Suspect Area
|
No
blower operation
|
1. Blower
fuse
|
2. Blower
motor
|
3. Blower
resistor
|
4. Blower speed
control knob
|
5. Wire
harness
|
No
air temperature control
|
1. Engine coolant
capacity
|
2. Heater control
assembly
|
3. Temperature
control knob
|
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
|
