Radiator and Condenser Fans High Speed Circuit Troubleshooting

Radiator and Condenser Fans High Speed Circuit Troubleshooting (Type S A/T Model)

1. Remove A/C diode B from the right side of the under-dashboard area.




2. Check for current flow in both directions between the No. 1 and No. 2 terminals of A/C diode B.

Is there current flow in only one direction?

YES - Go to step 3.

NO - Replace A/C diode B.

3. Turn the ignition switch ON (II).




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

Is there battery voltage?

YES - Go to step 5.

NO - Repair open in the wire between the radiator fan relay and A/C diode B.

5. Turn the ignition switch OFF.
6. Reinstall A/C diode B.
7. Disconnect the A/C pressure switch 4P connector.
8. Turn the ignition switch ON (II).




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

Is there battery voltage?

YES - Go to step 10.

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

10. Turn the ignition switch OFF




11. Check for continuity between the No. 1 and No. 3 terminals of the A/C pressure switch 4P connector.

Is there continuity?

YES - Replace the A/C pressure switch.

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