I had a 210 a number of years ago. An E430 I bought off lease w/ 50k miles. It was my wife's favorite car to date. I thought it was ok, but had some real weaknesses. One of these was the window operating systems. One of the other problems was the electrical system in general.
The windows are cable operated and not very robust. First check your electrical connectors for cleanliness. Even the act of disassembly/assembly can help. Most likely there is a problem with the cable mechanism.
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Chief
1991 350SD
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