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	Fan Fuse
	Fan Relay
	Blower motor
	Power MOSFET
	Fan Speed Switch
	Wiring Harness
No Air Temperature Control	Engine Coolant Level
	Heater Control Unit
Compressor Does Not Operate	Cooling Capacity
	A/C Fuse
	Compressor
	A/C Pressure Sensor
	A/C Switch
	Evaporator Temperature Sensor
	Wiring Harness
Vent Air Not Cold	Cooling Capacity
	Refrigerant Pressure
	Drive Belt
	Compressor
	A/C Pressure Sensor
	Evaporator Temperature Sensor
	A/C Switch
	Heater Control Unit
	Wiring Harness
Insufficient Cooling	Cooling Capacity
	Drive Belt
	Compressor
	Condenser
	Expansion Valve
	Evaporator
	Refrigerant Lines
	A/C Pressure Sensor
	Heater Control Unit
Engine Does Not Idle Well with A/C On	Engine ECM
	Wiring Harness
No Air Flow Control	Heater Control Unit
No Mode Control	Heater Control Unit
	Mode Actuator
Cooling Fan Does Not Operate	Cooling Fan Fuse
	Blower motor
	Engine ECM
	Wiring Harness