Chart C-10, A/C Compressor Clutch Circuit Diagnosis - 4.3L (VIN W & Z) S" & "T" Series A/T & 4.3L (VIN W) "T" Series M/T: Notes

A/C delay relay is used to delay operation of A/C compressor clutch for about 18 seconds after ignition is turned on. Regardless of A/C control position, delay relay is energized and starts its timer sequence when ignition is turned on.

1. Check for power to relay terminal No. 30 on circuit No. 901.
2. If A/C compressor clutch engages, compressor cycling switch is stuck open. Before replacing switch, check A/C refrigerant charge.
3. If voltage is present on circuit No. 66, circuit to relay terminal is okay.