Troubleshooting

Troubleshooting

Symptom Table

Before replacing or repairing air conditioning components, first determine whether the malfunction is related to refrigerant charge, air flow, or the compressor. Use the table below to find the cause of the problem. The numbers indicate the priority of the probable cause of the problem. Check each part in order. If necessary, replace these parts. After the malfunction is repaired, check the entire system to make sure it operates satisfactorily. Standard:

Symptom	Suspected Area
No Fan Operation	1. Blower Fuse
	2. Blower Relay
	3. Blower Motor
	4. Power MOSFET
	5. Heater Control Unit
	6. Blower Speed Switch
	7. Wiring Harness
No Air Temperature Control	1. Engine Coolant Reservoir
	2. Temperature Switch
	3. Heater Control Unit
Compressor Does Not Operate	1. Cooling Capacity
	2. A/C Fuse
	3. Compressor
	4. A/C Pressure Sensor
	5. A/C Switch
	6. Heater Control Unit
	7. Evaporator Temperature Sensor
	8. Wiring Harness
Vent Air Not Cold	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. Heater Control Unit
	3. Wiring Harness
No Air Flow Control	1. Recirculation and Fresh Air Intake Switch
	2. Heater Control Unit
No Mode Control	1. Heater Control Unit
	2. Temperature Switch
	3. Mode Actuator
Cooling Fan Does Not Operate	1. Cooling Fan Fuse
	2. Blower Motor
	3. Engine ECM
	4. Wiring Harness