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Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 2. These actions will disable the HVAC control module output to powertrain control module (PCM) or engine control module (ECM).
Fig 1: HVAC Compressor Clutch Does Not Disengage (Steps 1-8)
G01479253Courtesy of GENERAL MOTORS CORP.
Fig 2: HVAC Compressor Clutch Does Not Disengage (Steps 9-13)
G01479254Courtesy of GENERAL MOTORS CORP.
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