I found similar threads (to this question) but no real resolution provided. I am hoping that this is a simple adjustment needed, and not major replacement.

Have w124 1992 300e Sportline. One rear window refused to roll up all the way, stopping about 2" from top. The motor (regulator) seems to be working fine, sending window up/down with ease, no grinding, rattles, or other "bad" noises. When it gets 2" from the top, it sounds as if it stops just as it normall should...thinking it has reached the top. When going down, it does appear to try to go 2" too low as well.

I've read about a lot of w124 window regulator problems, and/or plastic slide/glide issues, but unless I am just missing this plastic piece...I just don't see any problem.

Can anyone explain a bit more about how the window mechanism/regulator works, and can it be adjusted at all?

I also found one thread that suggests the window can be electronically readjusted by lowering the window, holding the down swith for 3 seconds, then raising it to top and holding for 3 seconds. This didn't seem to work either.

Please help with any advise.

At least I learned how to pull off the door panel...with great advice and pics from these forums...and now plan to pull all 4 off 1 at a time and tighten bolts, trim pieces, etc.

THANKS

1992 300e Sportline (extremely rare red 4 door)

Well, had to take off the opposite door panel so that I could compare the 2 and see what is wrong. As suspected based on other threads, the "jaw" (I think others called it) had broken small plastic piece.

But, I am now a little confused. The motor seems fine. I have read other threads that make it sound like I can replace just the jaw, etc. Is that possible, or should I just replace the whole thing? (seems like the whole is the way to go). Also, looking online the price range for a rear regulator is all over the place...from $100-$400. The cheaper is obviously replacement, but "appears" to be same. Not sure which to go with. It is $400 through Fastlane, but I have always had excellent experiences with Fastlane in past.

The regulator guide jaw, is less than $6 from Phastlane Phil (see parts link above)http://catalog.peachparts.com/RenderScriptTemplate.epc?_cmd=epccat_VehicleAAA&cookieID=2G212TH442G31C5HNS&yearid=1992%40%401992&makeid=MB%40%40MB%40%40X&modelid=300%2DE%2D002%40%40300E&catid=O%40%40Body+Mechanical+%26+Trim&mode=PA&subcatid=O3035@@Regulator+Guide+Jaw&source=www.peachparts.com&clientid=catalog.mercedesshop
I have replaced one on a 126 body, but not on a 124 - your's looks like it might be a simpler procedure.
Unless the regulator is bent, or a gear is stripped, there is nothing wrong with it, and it should not need replacing (just replace the jaw, and save $$).

Good Luck!

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09 Jetta TDI
1985 300D