I find when my X5 is parked in the sun on a hot day, and I start it up and turn on the A/C on Max setting, several minutes later some parts of the front panel seem to creak/crackle. You described it well with the platic bottle description. I pushed my finger against the plastic area by the preset buttons and can replicate the noise. Only happens when going from one extreme temperature to the other. Perhaps something similar happening to you? But maybe in another part of the verhicle.
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