Fans High Speed Circuit Troubleshooting

Radiator and Condenser Fans High Speed Circuit Troubleshooting

1. Disconnect the A/C pressure switch 4P connector.
2. Turn the ignition switch ON (II).




3. Measure the voltage between the No. 3 terminal of the A/C pressure switch 4P connector and body ground.

Is there battery voltage?

YES - Go to step 4.

NO - Repair open in the wire between the radiator fan relay, the fan control relay and the A/C pressure switch.




4. Measure the voltage between the No. 2 terminal of the A/C pressure switch 4P connector and body ground.

Is there battery voltage?

YES - Replace the A/C pressure switch.

NO - Repair open in the wire between the A/C pressure switch and the A/C diode.