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 relay | |
3. Blower motor | |
4. Blower resistor or Power mosfet | |
5. Blower speed control switch | |
6. Wire harness | |
No air temperature control | 1. Engine coolant capacity |
2. Heater control assembly | |
3. Temperature actuator | |
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 actuator | |
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 actuator | |
No cooling fan operation | 1. Cooling fan fuse |
2. Fan motor, PWM | |
3. Engine ECM | |
4. Wire harness |
