I understand that the heater control valve for the 1995 E300 is a two position valve with heat and bypass which was only used that year. Mine is leaking and I understand that the sprinter uses a dual position valve with almost identical internal parts. Has anyone disassembled the brass plunger on their valve? I'd like to know if it comes apart so I can transplant the guts of a sprinter heater valve onto the plastic body from the E300.

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I am pleased that I was able to order the heater valve for a Dodge Sprinter 2500 Mercedes 600SL for $100 and use it to fix the leaking valve. The correct valve for the 1995 e300 is very expensive.

Basically, I carefully removed the solenoid and upper body of the valve from the leaky valve, ground off an indexing nubbin from the base and then installed the upper part of the sprinter valve with the outlet and solenoid connector flipped to the opposite side. It's working great.

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form member Jeremy5848 has been through this saga. He even got MB to replace these for free since there is a known manufacturing flaw in them.

http://www.peachparts.com/shopforum/diesel-discussion/345991-1995-e300d-monovalve-problem.html

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Yes, the W124.131 heater valve is a literal joke, there is a pipe nipple on it which was literally tacked on with glue.

My small repair lasted till the car floated away in the flood, the leak rate was about a drop/week when fresh and about a drop/month (assuming) when it was aged.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

Mine quit because the internal gaskets had failed. Coolant was getting into the solenoid. The part from the sprinter appears to be more robust than the 1995 e300 part.

The Sprinter valve sounds worth investigating, thanks! The body of mine leaked where the third plastic leg was tacked on; I was able to fix it with epoxy. The brass valve parts do come all apart; somewhere I've got pictures.

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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