Two power windows in my '92 190E do not move. The motors can be heard when the proper button is pressed, but there is a mechanical clicking as if some gears are not engaged or broken.

What am I looking at for parts and costs?

You will need the window regulator more than likely. Just look them up in the fastlane under 'online catalogue'.

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS

Dumb question, but are the windows in the "up" position? I drive my Benz only on weekends and have learned to store it (covered in the garage) with the windows cracked open a smidge. I've learned that they can "stick" to the seals in the "up" position. Just a thought -- have someone work the "down" button while you "palm" the inside and outside of the suspect window, adding downforce while the button is operated.

Good luck.

Brian16V