View Single Post
      12-20-2020, 01:59 PM   #25
Olgeezer1
Lieutenant
191
Rep
506
Posts

Drives: 2010 128i 6MT Sport Pkg. 18"
Join Date: Jul 2013
Location: Ottawa, Canada

iTrader: (0)

Garage List
I'm wondering about heat buildup on a hot day between the glass and a closed sliding shade. Since I've heard of this I always leave the slide open an inch or so just so you don't get that pressure buildup. Since the OP's glass bulged upwards, superheated air trapped between glass and slider looks like the culprit.
Appreciate 0