On my E430 the passenger side window gets stuck in the middle. On close inspection I can see that the window is slightly tilted and is out of the groove on the rear. If I push on the window a little bit towards the back the window will slide up but after some attempts. Any simple issue or I need the window regulator.

Thanks

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89, 300SEL
98, E430 black on black

Pretty sure it's the regulator, certainly wouldn't hurt to take the door panel off and have a look at it.
Gilly

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I had the same problem with my E420 just as we were leaving on a trip. It was Friday PM and no mechanics were available. I used packaging tape to seal the opening and drove 3000 miles. When I returned my mechanic found that the window cable had bound up and would not let the window close. It was an easy fix.
Anziani
'95 E420 Special Edition AT wheelsv 100K
'87 300E 170K (not a mark on her)