Test Description
CAUTION:
DO NOT engage A/C compressor clutch with the engine running if an A/C mode is not selected at the A/C control switch.
Numbers below refer to the numbers in the Diagnostic Procedure:
- 3
This test determines is problem is with refrigerant system. If switch is open, A/C pressure gauges will be used to determine if pressure switch is faulty or if the system is partially discharged or empty. - 4
Although the normal complaint will be A/C clutch fails to engage, it is possible for a short circuit to cause A/C clutch to run when A/C has not been selected. This step tests for that condition. - 7
There is an extremely low probability that both relays will fail at the same time, so substitution process is one way to check A/C Thermostat relay. Use a known good relay to do a substitution check.