Help on how to replace the part behind the vent on drivers side that opens and closes for air and heat mine is missing and I need to know how to take apart to put new one in. Thanks so so much, Kathy:hmm: Well let me tell you what it is doing the vents on passenger side blows hot and the passenger seat gets hot. But the passenger side will only blow cold air and the seat will not heat up either. So we took and hade it hooked up to a programer and they manually have it so right now it blows warm on driver side. But there is a plastic piece that is supposed to open and close for heat and air. And I can't find the name of part it goes in b back of the center control vent on drivers side!! Thanks