It's pretty normal. At first I put molly lube on the windshield locks thinking they were sticking, but it didn't make any difference. When those locks release, it sounds like your windshield is being pulled out of the car. Ignore the sound and enjoy the sun!

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Coast Aero Support Services, LLC
'92 MB 500 SL
'01 BMW 525i Sport
'98 Harley Davidson RoadKing
'74 BMW 3.0 CSi - Gone to a good home