| Troubleshooting |
| Problem Symptoms Table |
|
Symptom |
Suspect Area |
|
No blower operation |
1. Blower fuse |
|
2. Blower relay |
|
|
3. Blower motor |
|
|
4. Blower resistor, Power mosfet or PWM blower module |
|
|
5. Blower speed control switch or knob |
|
|
6. Wire harness |
|
|
No air temperature control |
1. Engine coolant capacity |
|
2. Heater control assembly |
|
|
3. Temperature control actuator or cable |
|
|
No compressor operation |
1. Refrigerant capacity |
|
2. A/C Fuse |
|
|
3. Compressor |
|
|
4. A/C pressure transducer |
|
|
5. A/C switch |
|
|
6. Evaporator temperature sensor |
|
|
7. Wire harness |
|
|
8. High CAN |
|
|
No cool comes out |
1. Refrigerant capacity |
|
2. Refrigerant pressure |
|
|
3. Drive belt |
|
|
4. Compressor |
|
|
5. A/C pressure transducer |
|
|
6. Evaporator temperature sensor |
|
|
7. A/C switch |
|
|
8. Heater control assembly |
|
|
9. Wire harness |
|
|
10. High CAN |
|
|
11. Temperature control actuator or cable |
|
|
Insufficient cooling |
1. Refrigerant capacity |
|
2. Drive belt |
|
|
3. Compressor |
|
|
4. Condenser |
|
|
5. Expansion valve |
|
|
6. Evaporator |
|
|
7. Refrigerant lines |
|
|
8. A/C pressure transducer |
|
|
9. Heater control assembly |
|
|
10. High CAN |
|
|
No engine idle-up when A/C switch ON |
1. Engine ECM |
|
2. Wire harness |
|
|
No air inlet control |
1. Heater control assembly |
|
2. Intake actuator |
|
|
No mode control |
1. Heater control assembly |
|
2. Mode control actuator or cable |
|
|
No cooling fan operation |
1. Cooling fan fuse |
|
2. Fan motor |
|
|
3. Blower resistor, Power mosfet or PWM blower module |
|
|
4. Engine ECM |
|
|
5. Wire harness |
Special service tools
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...
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