Try spraying some silicone into the guides. Use one of those tubes attached to the spray nozzle.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe

Norm

Funny you should post this email as I have a similar problem.

Mine is on the LH window on my CE. This is the passenger side on my car. The door on the coupe is frameless. I don't know if this is the same on the 4 door?

The drivers RH side works fine. Easy up and down.

The LH side is very tight through part of the movement as you describe and is accompanied by a squeaking sound.

I have done the following:

1. Removed door panel and fully inspected the working parts. All seem fine and I lubricated all parts and checked for interference. No obvious problem seems to exist.

2. By removing the lower external door trim the slider adjusters are exposed. I adjusted these to try and relieve pressure off the seals i.e by moving the bottom of the frame inwards the top of the glass is forced outwards.

Whilst I might of improved it marginally the problem still remains. I do believe it is intereference with the seals when the window comes in contact. On the coupe this is in the top half of the movement. There is quite a bit of 'shape' in both the glass and outer frame.

There is particularly a large contact point with the seal that is part of the rear glass.

I wonder if as the seals age there is additional rubber exposed causing excessive friction. The seals appear to have an almost felt like quality that would no doubt assist the sliding motion.

Perhaps the adjustment of the door is a large factor?

89 300CE
146k kms

Well, I tried spraying with a "dry teflon" lube in the seal channel. It maybe helped a little. This kind of confirms my suspiscion that theglass sits a bit too far to the rear. Unfortunately, that seems to be the one dimension that's welded in place. I think I'm going to accept this as "close enough".

BigBlue, On the 4 door sedan, there is a door frame that the glass slides in. I can play with the motor either door open or door closed & get the same results. All my disassembly in on the inside of the door, outside is solid. I know what you mean about the "felt like". It's kind of a fuzzy coated rubber.

Sounds like no one has cured these ills before.

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Norm in NJ
Next oil change at 230,000miles

I have the same problem in the front passenger door window in my 87 300e. Dissambled door, cleaned & lubed but no improvement. However, the glass seems to slide up with less restriction when the weather is colder, suggesting contraction of rubber seals is helpful. Hope someone comes up with something.

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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)

After a bit more investigation on the window I am of the believe that the external horizontal seal is the major culprit.

On the coupe the window can be operated with the door open and as it has no window frame this friction can be discounted.

I have noticed that the external seal is quite deep. It also has the longest and most consistent contact point to the surface of the glass. The coupe door is longer than the sedan door as well.

In trying to clean my seal I noticed that it is very dirty and heavily impregnated with filth and grime. I was able to remove a lot of this with a rag over a plastic knife carefully running along the seal.

I would suggest that replacement of these would make a major difference.

Does anyone know how it is done? Does the anodised trim piece have to come off?

89 300CE
146k kms

My '84 300CD has a similar problem. Aside from the fact that there are actually gaps in the seals.

I've had no luck at all finding a source for a replacement.

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.

Anyone have an update or good news for the rest of us with this problem?

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz