Jim,
Monovalves are among the easiest service tasks that you can do. The valve is easy to find and work on on the 123 (much easier than on the 126).
You can either replace just the active part, by removing the four screws on the top of the valve body and lifting it out (remember to unplug it first. Then drop a 'new' one in, reinstall the screws, connect the plug and you're good to go.
Or you can pull the whole thing by unplugging, then disconnecting the water hoses, then dismounting. Install the 'new' one.
I say 'new' instead of new, because these are easily pulled from cars in P-a-P yards. You can open the valve up (remove the four screws) and see if the rubber is OK, and see if the channels look clean or clogged. CHEAP, CHEAP, CHEAP. And good exercise walking the yard.
In a message dated 10/6/2011 7:01:58 A.M. Pacific Daylight Time, jim@tazwade.com writes:
Howdy, the monovalve on my 84 300D lets coolant through all the time, never completely shuts it off, raises the air temp 10 - 15 degrees at its coldest setting when it should be shut off. The valve was replaced a couple years ago by a Mercedes shop. Seems too soon for it to have gone bad, but who knows.... I see that those valves have rubber washers or o-rings or whatever rubber parts on them to create the seal to stop the flow of coolant, and was wondering if there is a seat inside the monovalve housing that could be pitted or corroded that could be causing the rubber parts of the valve to not seal properly. I have never taken one of these apart. Any advice is appreciated. I'd like to fix this once and be done with it for a while.
Thanks,
Jim
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