have a 2001 dodge ram 4x4 5.9 sport when i sit the air flow on vent it wii go to floor or it will go to defrost bought a small in line canster from dealer no luck also bought a in line vacume that goes to in line by intake no luck Also i will be driving down the road lift my foot off throttle if it is sit on vent it will go to defrost and i will hear a door close under dash. don"t no what to do next. Hope you guys can help. Thanks Also great site.