Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Engine running, press the A/C request switch. The A/C compressor clutch should engage.
Place the mode switch in the defrost position. The A/C compressor clutch should engage.
- If the clutch does not engage refer to Air Conditioning (A/C) System Performance Test (Short Wheel Base) , Air Conditioning (A/C) System Performance Test (Long Wheel Base 1500) , Air Conditioning (A/C) System Performance Test (HP2) , Air Conditioning (A/C) System Performance Test (Long Wheel Base 2500)