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Hello there. I hope that someone can answer this one. I see there have been some postings about heating and AC problems. I have a 2006 GMC 2500HD with Duramax. It only has 138000 KM on it so far. In the winter, the heater will start blowing ice cold air from both sides. I do the recalibrate sequence and it behaves for a while. I have driven many miles in -30 deg C weather with no heat. In the summer, the driver's side will pump out the heat. The pass side is cold. The recalibrate only solves the problem for one restart. This heat issue has been around a lot longer than the cold issue. Are these two problems related? What do I need to replace to fix this? Thanks for your help! Laurence