I am new to Hummer and this forum, please bear with me...I have a 2006 H2 and the only real problem I have is the AC blows half through the bottom vents and half through the defrost vents...Then when with no heat on once in awhile it will seem like heat and air are working against each other. The Cadillac Dealer here in town that used to sell Hummer is outrageous in price and parts and not very customer oriented.....I am hoping someone wouldn't mind helping me out with this, I love the Hummer! I don't drive it daily its more of a weekend vehicle.. anyway Thanks