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Old 08-13-2005, 06:39 PM
speedy's Avatar
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Join Date: Mar 2005
Location: Texas
Posts: 123
124 window reguators

I just had a bunch of fun replacing the passenger side rear regulator assembly on my 1991 300D. To date, this is the only time I have found a part to be under-engineered in my car, and I have to say that I'm disappointed in Mercedes for it.

BOTH of my rear windows broke within a week. I scoured the yards and found a few replacement regulators, most of which were broken. Found a good one from an '86 300E for the right rear but when I got it home I found it was not quite the same as my '91. The angle the regulator mounts to the door is different, as is the angle that the motor mounts to the regulator assembly. I made it fit, but it wasn't pretty. Had to drill some new holes in the door and "clearance" the ashtray bezel on the inside. No visible difference once it was reassembled though.

The reason for both failures was the plastic block which controls the ends of the cables. When the window hits the stops there is a lot of force applied to the block and it simply breaks. The part cannot be removed from the regulator assembly and the dealer only sells the whole assembly with motor for nearly $400. Why Mercedes did not cast that block out of metal I will never understand! The front doors on my car as well as all of the older models that I have come into contact with all have the more standard geared-bar type regulators that seem to be more reliable.

I'm sure many of you are already aware of this and maybe there is a known solution - my research in the archives did not turn up much.

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Old 08-14-2005, 01:22 PM
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Join Date: Jun 1999
Location: Albuquerque, NM USA
Posts: 1,947
Plenty of these on eBay.
Kent Christensen
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles
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Old 08-14-2005, 01:53 PM
speedy's Avatar
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Join Date: Mar 2005
Location: Texas
Posts: 123
None at the moment, unless I am not searching correctly. I only found one of the older style (pre-1990) which I can make fit if I have to. I'd rather have the correct one for the car though. I will keep an eye out - thanks.
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Old 08-14-2005, 11:25 PM
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Join Date: Jan 2005
Location: Minnesota
Posts: 975

This guy has a bunch of various regulators BIN for $48.95 + shipping. Remeber to look in the buy it now items as well as auctions
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Old 08-15-2005, 12:09 PM
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Join Date: Apr 2002
Location: westchester, ny
Posts: 747
Dave, I have to do the rear on my 87 300e. I pulled the door panel & noticed that, unlike the front door, there is no 2-screw terminal to connect the window motor wires with the power wires coming into the door frame; however, there is a red wire which is spliced into the motor wire harness near the 6 pin connector for the switch. Did someone monkey with the wiring on mine, or is that how it's supposed to be? Thanks.

87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)
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