Quote:
Originally Posted by Mercedes Man
86-300sdl,
I have observed that the monovalve has a very long 1/2 inch stroke length when I tested it with the battery and monovalve coil outside the housing. I believe that the monovalve with the spacer o-ring still closes as normal since I do not see the temperature of the center vent rising when the climate control is set to cool without air conditioning.
I tested the heat at 65 mph and saw 145 degree heat. I think the pump does help at lower speeds. I noticed that the heat increases when the engine rpms rise. This condition has not happened in the last week and temperature has been comfortable.
I would like to do more observations of the solution such as long high speed drives, but this is much better than having no heat at all.
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I'm going to give it a try tonight. I was ready to bite the bullet and by a whole new mono-valve unit from MB for a cost in the neighborhood of $250.
Thank you for adding the "Fix" to the forum. These days I'm not one to "jerry-rig" fixes. Although at one point in time, I always had a spool of bailing wire in the trunk (other vehicles). LOL
In this case it certainly fits into the "improved engineering" fix category
