I have a 2002 f 150. When you turn the air control **** on it does not matter which position you put it in the air comes out in different places. You could turn it to the panel position and it might come out the defroster position for awhile and start coming out the floor or the panel it just kind of alternates from one zone to another . Is there some kind of module or something that can be checked . Or is this a vacuum problem Any help pls thanks