I drive a 98 AWD Explorer. I bought it in 2005, at which time the air temperature control was not working. So essentially, I could either get hot air with the heater or vents on, and cold air with the AC. But I could turn the system off and close the vents as well. A while ago, the AC stopped working and at the same time my vents started blowing out hot air. The air gets hotter as I drive more miles, and it blows from all vents in the truck, including the ones by my feet. There is no way to shut it off, and AC does nothing. I have read a bit about blend doors and am not sure if that is my problem. PLease let me know what you think.