My sunroof has a tendency to get stuck if I open it more than halfway, and I accidentally opened it today while trying to close it and drive at the same time (I can never remember which side of the button closes or opens it, due to lack of use). Now it's stuck and no amount of brute force seems to help, not to mention I don't even hear the sunroof motor at all. With my luck, I'm sure there will be a heavy rain tonight. Any suggestions?

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1985 190D 2.2L 717.411 5-speed
1983 300D Euro OM617.950