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While both sides are calling for cooling, the drivers side cools while the passenger side heats (blasts hot air)
This could be the HVAC module, I've heard some are being reprogrammed if one side is not functioning properly. This should be covered under your basic warranty if it hasn't expired.
Common Problems > GMC Yukon Denali
Q&A > GMC > 2007 GMC Yukon Denali
Q&A > GMC > 2005 GMC Yukon Denali