GM Service Manual Online
For 1990-2009 cars only

Refer to Engine Controls Schematics

A/C Compressor Controls


Object Number: 552627  Size: FS
Engine Controls Components
HVAC Compressor Controls Circuit Description
A/T Internal Switches, TFT, PC Solenoid, and TISS
OBD II Symbol Description Notice
Battery, and Underhood Fuse Block
IGN A Fuse and Ignition Switch
BRAKE and HTR-A/C Fuses
IGN B Fuse and Ignition Switch
G105 (1 of 2)
G105 (1 of 2)
Handling ESD Sensitive Parts Notice
Cell 14: G200 (4 of 4)
Handling ESD Sensitive Parts Notice
.

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 CCOT Air Conditioning (A/C) System Diagnosis for diagnosis of the system.