Envoy 2WD V6-4.3L VIN W (1998)
A/C Signal: Description and Operation
DESCRIPTION
The A/C request circuit signals the VCM when an A/C mode is selected at the A/C control head.
OPERATION
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.
DIAGNOSIS
Refer to System Diagnosis / DTC Tables / System Diagnostic Tables / A/C Clutch Circuit Diagnosis for A/C wiring diagrams and diagnosis of A/C
electrical system.
