Troubleshooting

Troubleshooting

Symptom Table

Before replacing or repairing air conditioning components, first determine whether the malfunction is related to refrigerant charge, airflow, or the compressor. Use the table below to locate the cause of the problem. The numbers indicate the priority of the likely cause. Check each part in order. Replace these parts if necessary. After repairing the malfunction, check the entire system to make sure it operates satisfactorily.

Standard:

Symptom	Suspect area
No Fan Operation	1. Blower Fuse
	2. Blower Relay
	3. Blower Motor
	4. Power MOSFET
	5. Blower Speed Switch
	6. Wiring Harness
No Air Temperature Control	1. Engine Coolant Reservoir
	2. Heater Control Unit
Compressor Does Not Operate	1. Cooling Capacity
	2. Air Conditioner Fuse
	3. Compressor
	4. A/C Pressure Sensor
	5. A/C Switch
	6. Evaporator Temperature Sensor
	7. Wiring Harness
Does not cool well	1. Cooling Capacity
	2. Refrigerant Pressure
	3. Drive Belt.
	4. Compressor
	5. A/C Pressure Sensor
	6. Evaporator Temperature Sensor.
	7. A/C Switch.
	8. Heater Control Unit
	9. Wiring Harness
Insufficient Cooling	1. Cooling Capacity
	2. Drive Belt
	3. Compressor
	4. Condenser
	5. Expansion Valve
	6. Evaporator
	7. Refrigerant Lines
	8. A/C Pressure Sensor
	9. Heater Control Unit
Engine Does Not Idle Well with A/C On	1. Engine ECM
	2. Wiring Harness
No Air Flow Control	1. Heater Control Unit
	2. Intake Actuator
No Mode Control	1. Heater Control Unit
	2. Mode Actuator
Cooling Fan Does Not Operate	1. Cooling Fan Fuse
	2. Blower Motor
	3. Engine ECM
	4. Wiring Harness