K 2500 Truck 4WD V8-6.5L DSL Turbo VIN S (1998)
A/C Signal: Testing and Inspection
CIRCUIT DESCRIPTION
Turning ON the air conditioning supplies ignition voltage to the A/C compressor clutch and to the PCM to increase and maintain idle speed.
The PCM does not control the A/C compressor clutch. Therefore, if the A/C system does not function, refer to Heating and Air Conditioning /
System Diagnosis for diagnosis of the system.