Like many others my air vent started buzzing around 40mph and it was annoying. I saw on several forums this was not unusual. I finally got the parts ( flap door & button mechanism) and convinced my service Dept to let me install them myself since it would be about Valentines NEXT year before they could work me in! I was worried the re-fit would do no good since parts looked the same but - it did, no more buzzing 

