1994 E320 Sedan, with 158K.

I've had a problem with the drivers power window for some time. At first, the wind started whistling at the top, and I thought I needed a new seal.

Then, it began sounding like a cogged belt was slipping on a nylon gear down in the regulator system, and the wind noise got louder.

Now, the window won't close without leaving a tiny gap at the top, and the 'cogged belt slipping' sound', is weakening to more of a muted rattle.

I havn't seen a diagram of the regulator and motor, but the sound is so distinctive, I thought someone out there might have an idea of what it likely is.

For now, I've applied a nav system suction cup to the window, and am able to lift it tight now and again while running the motor up.

Any help would be much appreciated.

Mark