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I have the exact same "Popping" noise
I have an 08 x5 and have the exact same popping noise coming from behind the dash, Much much worse when defroster is on, and yes, non-existant in the summer. I actually turned my defroster off b/c it was so bad. Please post what you find out, I will be taking mine in for the fuel pump recall in the next few weeks and will mention it then.
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