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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.