I figured out where I was losing coolant, and why my windshield always looks way worse when I spray it. Anyone care to venture a guess?

And how I might remedy said issue?

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'92 300D 2.5
'99 E300TD

I'll venture a guess. Leaking heater core?

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"The MB W123 is so bulletproof, you can drive them forever. Which is a good thing as it takes that long to get anywhere."
Betsie: 1984 W123 300D (hobby, 280k miles)
Myrla: 2001 Mazda Protege 2.0 ES 5spd (daily driver, 130k miles)
The Turd: 2007 Toyota Camry (wife's car, 118k miles)

Leaking ww tank heater. Both my cars had that problem. I was able to take the heaters apart and replace the o-rings. Leak stopped.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Bingo. I hope....

O-rings?

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'92 300D 2.5
'99 E300TD

https://www.youtube.com/watch?v=BjWBXIdYHU4

video showing close up of the o-rings including damage

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1981 NA 300D 310k miles

Thanks for the info.

I had the same smearing on my 1999 E300 windshield after a squirt of washing fluid. Took it apart today and the O rings were torn and distorted.

Purchased a set of various sized O rings, one was perfect, reassembled and brought it up to temperature and pressure. Looks to be a thin O ring 3/8 ID.

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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-(
2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250