Greetings,
The driver's side front window on our '89 420SEL no longer moves up or down when we activate the window button. We can hear the window motor working, but the window does not move. This began after we heard a clunk sound from inside the door panel.
I am trying to make an assessment as to whether I should delve into this problem myself or just take it to our mechanic. Any ideas on the causes of a problem such as this?
Could someone also give me a condensed version of the sequence of steps and any specialized tools necessary to get into the inner workings of the window mechanism?

Thanks,

Dan Boyce