KM53 - Check A/C Relay

- Key "OFF".

- A/C clutch disconnected.

- Reconnect A/C relay.

- Jumper A/C ON circuit at A/C relay vehicle harness connector to battery ground.

- Key "ON".

- Measure voltage between power side of A/C clutch vehicle harness connector and chassis ground.

- Is voltage greater than 10.5 volts?

Yes -- Key "OFF". Remove jumper. Electronic Engine Controls (EEC) system OK. Refer to Heating and Air conditioning to check for proper ground, open circuit in clutch, mechanical concerns, etc.

No -- Replace A/C relay. Reconnect all components. Re-evaluate symptom.