## Air Conditioning

#### Radiator and Condenser Fans High Speed Circuit Troubleshooting

21-17

1. Remove the A/C diode B from the multi-relay box.

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

A/C DIODE B

Is there current flow in only one direction?

YES - Go to step 3.

NO - Replace the A/C diode B.

1. Turn the ignition switch ON (II).

1. Measure the voltage between the No. 2 terminal of the A/C diode B 3P socket and body ground.

A/C DIODE B 3P SOCKET

Is there battery voltage?

YES - Go to step 5.

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

1. Turn the ignition switch OFF.

1. Reinstall the A/C diode B.

1. Disconnect the A/C pressure switch 4P connector.

1. Turn the ignition switch ON (II).

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

A/C PRESSURE SWITCH 4P CONNECTOR

Wire side of female terminals

Is there battery voltage?

YES - Go to step 10.

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

1. Turn the ignition switch OFF.

1. Check for continuity between the No. 1 and No. 2 terminals of the A/C pressure switch 4P connector.

A/C PRESSURE SWITCH 4P CONNECTOR

Wire side of female terminals

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.

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