I don't think "unglued" is the right word. The window is held in by it's seal. The seal is "melted" and the window pushed into it, just like the front windshield. A new seal and reinstallation shouldn't cost more than $100. Find out who does the glass work for the dealer.

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Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino