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My 2014's been doing that since 3/17. It doesn't happen all the time and usually after I've driven the car, let it sit awhile, when it's cooler outside than in the garage and I open the garage door. My dealer hasn't been able to replicate it so they can't fix it. I found a BMW mechanic online (can't remember off-hand who it was) who said it's some kind of a pressure equalizing valve (something like that) in the A/C system. After almost 5 years there has been no apparent effect on the climate control. I also always use the automatic function.
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