Last year I installed the Klima Design works monovalve replacement kit on my 560SEC.
It wasn't a drop in replacement, but worked well and was a good option given the Bosch rebuild kits for the monovalve are NLA.
I've just seen they have updated their kit with a true drop in replacement.
I would have used this kit, had it been available early last year.
I am also interested in their paralell flow condenser, which I will probably try on one of my cars in the next twelve months.
My project last year:
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It wasn't a drop in replacement, but worked well and was a good option given the Bosch rebuild kits for the monovalve are NLA.
I've just seen they have updated their kit with a true drop in replacement.
I would have used this kit, had it been available early last year.
I am also interested in their paralell flow condenser, which I will probably try on one of my cars in the next twelve months.
My project last year:

W126 Monovalve eliminator – part 1
My 560SEC has been having a couple of problems with its cooling system. Coolant has been weeping out of the top tank of the radiator. In addition, the monov
www.classicjalopy.com

W126 Monovalve eliminator – part 2
My 560SEC had been leaking coolant and giving me heat when I didn't want it. Last week I started the repairs for these problems. As the Bosch and Merced
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W126 Monovalve eliminator – part 3 « Classic Jalopy
Final installation of the coolant hoses of my W126 monovalve elimination project. A hose from a Toyota Hilux LN106R fit quite well.

W126 Monovalve eliminator – part 4
I have now completed the installation of the Movovalve elimination kit on my 560SEC. So far so good. Most importantly, I don't have heat when I don't want
www.classicjalopy.com