Cooling Fan Control Inspection

Cooling Fan Operation

Condenser fan relay

1. Verify that A/C switch and fan switch are off.
2. Start the engine and let it idle.

3. Verify that the condenser fan is not operating.
- If condenser fan is operating, inspect for the following:
- Condenser fan relay is stuck in closed position.
- Short to power in circuit between condenser fan relay and condenser fan
- Short to Ground in circuit between refrigerant pressure switch and PCM terminal 41
- Short to Ground circuit between condenser fan relay and PCM terminal 45 (ATX) or 96 (MTX)

4. Turn the A/C switch and fan switch on.
5. Verify that the condenser fan is operating and operation sound of A/C compressor magnetic clutch is heard.

6. Turn the A/C switch and fan switch off.
- If the condenser fan does not operate but operation sound of A/C compressor magnetic clutch is heard, inspect for the following:
- Open circuit between ignition switch and condenser fan relay
- Open circuit between battery and condenser fan relay
- Open circuit between condenser fan relay and PCM terminal 45 (ATX) or 96 (MTX)
- Open circuit between condenser fan relay and condenser fan motor or fan motor Ground
- Condenser fan relay is stuck open.
- Condenser fan motor

- If both condenser fan and A/C compressor do not operate, inspect the following:
- TP V PID
- A/C system