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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1300 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> Air Conditioning Compressor Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine running, press the A/C request switch. The A/C compressor clutch should engage.
  2. Place the mode switch in the defrost position. The A/C compressor clutch should engage.