This is driving me nuts!. I hear a clicking noise comming from the rear window on the passenger side top corner. On a uneven road It sounds like someone is sending me morse code. Then it would go away then later it comes back again. I took it in to the dealer last month. They said that they glued something under the headliner but like always they didnt fix the problem. I can push up and down sometimes on the window and make it click bit when i am driving it drives me nuts. Anyone else had this problem. I have an 05 "6". Thanks for the help

 

You mean rear doorwindows or big rear window which with heater stripes?

 

Rear window with heater

 

Do you have side air curtains? There could be a wire tapping against the inside of the c-pillar trim.

 

I have the same problem, the window suddenly starts clicking, and also suddenly it can stop clicking...periodically.