1991 W1126 500SE rust under rear windscreen - how?

Roygarth

Active Member
Joined
Aug 12, 2009
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99
Location
Norfolk
Car
1983 W123 230E
This is a known weakspot on these cars and mine is now showing first signs of it.

My question is how does the water get through?

My guess is that water is leaking through between glass and rubber seal?

If so is this because seal has dried and contracted slightly and therefore not creating a tight seal anymore?

If so is it worth replacing the seal? Or would I haver to replace entire windscreen?

Any thoughts? Thanks.
 

EDZ649

MB Enthusiast
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Jan 25, 2009
Messages
3,998
Location
1066 Country
Car
R129 SL600 V12
I recently replaced the front screen seal on my 116 due to it having perished and was leaking quite badly. Fortunately for me there were no rust issues. My advice is to find an old school screen fitter who has worked on older cars with chrome trims before. The guy I used charged me £100 cash but it was worth it as he knew exactly what he was doing and managed to remove the screen and refit it without any damage. I used a genuine MB seal too, not a pattern part.

I believe the rear sunroof drain pipes run down the 'C' pillars so may be worth checking to see if these are blocked, not sure if this could be related to your issue though.
 

ss201

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Aug 29, 2009
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864
Location
Near Lancaster UK
Car
190E 2.6 Sportline, W203 320 CDi SE Estate
The W201 is of the same era. It's not unknown for water to get under the seal and cause corrosion of the channel at the base of the screen. The only way to find out is to remove the rear screen and check. Any corrosion needs to be dealt with now before it gets any worse. If the seal itself needs replacing (it's now nearly 20 years old), then it's visit the dealer time and fit a new seal.
 

Howard

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Apr 23, 2004
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Toad Hall
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CLS 500 / A 150
We use Cap't Tolleys on boats , it's good stuff.
 

grober

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Jun 22, 2003
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Perth, Scotland
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W204 C200CDI Estate
According to the MDS is an aqueous dispersion of styrene – acrylic acid ester copolymer for anyone interested.:dk:
 

jaymanek

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The screen has to be removed and a new section of steel welded in. Mercedes sell a repair panel for not a lot of money.
 

Pontoneer

Hardcore MB Enthusiast
Joined
Aug 19, 2002
Messages
14,256
Location
Central Scotland
Car
'99 S320 W140 ; '93 300SL-24 R129
I'm sure I read somewhere recently that the seals are no longer available from MB .

Pity , as my 280 has the same problem and my 500 is just showing the beginnings of it .
 

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