As was mentioned earlier, the plastic "sliding jaw" is the usual cause of these windows not working. The regulator or motor failing is VERY rare on most MB models!

It's a reasonably simple fix. If you have a friend with some basic tools who has half an hour, he can do it for you. Search for posts under my name from a few years ago.. I explained it in an earlier post.

Do NOT let this guy change the entire regulator.. it's a ripoff unless he can prove it has failed.

Temporary fix - pull off the door panel (search the forum for how) and reach in & push the window up. Cut a 2x4 to exactly the proper length, then put it between the bottom edge of the window and the door bottom (thereby holding up the window).

Bought an 83 300SD and the window wouldn't move.. then I found the 2x4 holding it up.. so I know this works

Neal

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'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
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'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi) SOLD
'07 S550 4MATIC 235,000km (146k mi) SOLD
'07 GL320 CDI 4MATIC 348,000km (215k mi)
'13 GL350 BlueTec 4MATIC 170,000km (105k mi)
'14 SL550 72,000km (43k mi)