I have a '06 LBZ CC SB with the dual zone climate control. I have noticed several times in cold weather (I live in Georgia so I know cold to me means different numbers than a lot of you) in the mid-low 20's while on the highway for extended period of time, the temp in the cab climbs to the point I have to continually lower the temp setting to stay comfortable. Last night I started out in Atlanta (30 degrees) with the control set on 72 degrees. Within the first hour I had reduced it to 68 degrees to stay comfortable (this was all at night so the sun shining through the glass wasn't an issue). Over the next hour or two I had turned it down to 64 (the outside temp had decreased to 19 at this point). Any ideas what this might be? I'm beginning to feel my first trip to the dealer for a bit of warranty. All else with this truck is superb and I now have 14,000 miles on it. Thanks for any thoughts. Ed