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Old 04-01-2010, 04:34 PM
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Join Date: Nov 2003
Posts: 155
Rust areas? 1989 300E

I have a 89 300e showing some signs of rust near the C pillar. Adjacent to the rear window frame/rubber to body area. Seems the drainage was poor or simple plugged up to collect grime and moisture.

Anyone with similar issues or where else do I need to start looking for other cancer spots.

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Old 04-02-2010, 10:33 PM
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Join Date: Dec 2007
Location: NorCal
Posts: 1,332
Maybe the sunroof drains got clogged? There are two that run back from the sunroof, straight back and down the c-pillar. W124 is fairly good chassis for rust issues. But if you live in the rust belt, anything is fair game. Get a flashlight and check out the underside of the car thoroughly.....the wheel arches are also a common rusting point.
1991 300E - 212K and rising fast...
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Old 04-03-2010, 09:23 PM
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Join Date: Feb 2000
Location: Canada
Posts: 1,774
Check trunk lid seam, under door seals and especially the car jack cavities on the rocker panel. I would remove the covers on these and spray the interior with Krown T-40 (or similar product). Rust can start here and eat into the rocker and underpanel. You generally won't notice it until it has progressed past the point of easy repair.

I also coated the inner rims of the wheel arches with a rubberized rockerguard paint, which really helped prevent rust there. Could use POR-15 as well.

Good luck!
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired

"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon

Last edited by Zeus; 04-03-2010 at 09:29 PM.
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