Do you have the screen clearing mode on? With climate controlthat engages the air con and makes it chilly! In my experience you have a choice- be able to see where you're going or freeze! Incidentally, there is no such thing as a 2007 LTZ- LTX with the wrong badge (the LTX badge is routinely replaced with LTZ of the tailgate is repainted as it doesn't appear on the Chevy parts list- its a Daewoo part...).