I experienced the same problem with a 2004 Yukon XL a couple of years ago. A/C cooling eventually completely malfunctioned. Dealership diagnosed it as a controller failure which was located behind dashboard. If I remember correctly the repair pretty much required removal of dashboard to replace controller. I think it was around a $500 repair! It was my wife's vehicle and although it was ready for replacement she couldn't decide on a replacement vehicle model so had it repaired.
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