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I have a 2011 X3 and have had this issue since the beginning. Definitely gets worse with colder temps (I'm in Buffalo, NY). I have mentioned this to the dealer probably 5 or more times when I have it in for service and their remedy is to try the felt tape solution. My service adviser even said BMW put out a bulletin about it to service advisers. Well that solution worked for a couple days but the clicking noise always comes back. I have 37,000 miles on the X3 now, and I am just getting fed up. Next time it is in for service I want to demand some kind of mechanical fix because the felt tape solution is just not working. I agree it is from the black center piece between the two glass plates. A thicker piece of foam to keep the the plastic piece from vibrating might work. It just annoys me that I payed 40k for a vehicle which just seems cheaply constructed.
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