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The W123 chassis covers 240D's, 300D's, 300TD's, 280E's, and several other models of Mercedes coupes, sedans and wagons from model years 1977 to 1985.

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mono valve installation instructions

Best way to install a mono valve?

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@lochlan , Baron, Find below a video link showing testing/removal/replacement of the heater control valve/mono valve in a 1990 W126 should be simsilar to your model and give you a good idea of what your in for. , Good luck.

I hope this helped you out, if so let me know by pressing the helpful button.

https://www.youtube.com/watch?v=PF3jmwCr...

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Baron Cheffer will be eternally grateful.
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