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I have solved it after 12 months of dealer "warranty doesn't cover rattles" versus my persistence.Started on passenger side A pillar dash , volume and frequency varied with temperature and type of driving.Spread to both sides.
Solution cost 50 cents and makes BMW service look like idiots.
Inserted small rubber discs that are attached to the bottom of chairs between windscreen and dash where the A pillars join dash.
Cracking noise went away.
Dealer then reallocated the same rubber discs- they said they were the perfect size in the same place but under the dash where it meets the windscreen- removed trim secured by tape etc and voila.
I wonder if I should send a bill to BMW for the intellectual property but I suppose they would not even stump up for the 50 c rubber disks I bought.
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