I own a 2004 Silverado SS with the duel digital climate controls. I have an issue with the air conditioning. When going down the road the AC is great, it blows out cold air fine. It's when I am driving slow or idling when the AC seems to go crazy. It will start blowing out warm humid air for the most part then may switch to blowing out cold air. I don't think the the freon is bad becuase when it works it's ice cold. It seems like and electronic issue like a bad sensor. Has anyone had this issue before?