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  #1  
Old 10-09-2018, 07:31 PM
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1995 E300 Heater control valve

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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Old 12-13-2018, 03:00 AM
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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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  #3  
Old 12-13-2018, 07:34 AM
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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.

1995 E300D Monovalve Problem
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Old 12-13-2018, 01:53 PM
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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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1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)
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  #5  
Old 12-13-2018, 03:01 PM
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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.
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  #6  
Old 12-14-2018, 12:25 AM
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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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