Need help, my 94 gt when running heat through defrost works fine but when I try to switch it to ac or through vents won't switch air flow to them what is the part I need to fix this problem or what might be causing issue? I know I just changed a directional motor on my wife's 2014 explorer for the heat/ac but not sure this old of car has a part like that or what it is called any help is greatly appreciated?