Certainly I can't be the only one who is experiencing this problem. Every now and then there is a real annoying "itching" sound coming from the top of my dash. I know it has something to do with the defroster vent but I can't figure out waht makes this noise come and go---I know that it's one of those things if you take it to a dealer they won't be able to find. I also know that it has something to do with the defroster vent because when I reach forward and press on it while it is making the noise I can somewhat stop it. THIS IS DRIVING ME CRAZY! Can any of my enterprising fellow Thunderbirders give me advice? HELP!