The sunroof on my 1990 190E 2.6 is stuck. To begin with, it wouldn't close. Then, it wouldn't tilt. Now it won't open, close or tilt--working the switch produces only clicks. I have used the manual crank to open and close it, but when I try to tilt it with the crank, one side sticks. I have replaced the switch (old one worked only when it wanted to!) but the problem remains. How should I go about fixing this?

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Sean Griffin
1990 190E 2.6