C 2500 Truck 2WD V8-454 7.4L VIN J SFI (1996)
A/C Signal: Description and Operation
The A/C request circuit signals the VCM when an A/C mode is selected at the A/C control head. The VCM uses this information to enable the A/C
compressor clutch and to adjust the idle speed before turning ON the A/C clutch. If this signal is not available to the VCM, the A/C compressor will be
inoperative.
