Hi BenzMatic and Melted Panda, Kudos to you guys and the forum, "Maxxie" my 300SD now has HEAT. Really not sure what the problem was, but I re-flowed the circuit board, cleaned out the dust balls in the temp control wheel, cleaned and re-installed the monovalve, changed the fuse and other things, the heater and blower now work, not sure about air conditioning yet. Again thanks!!!
Now my attention for the next week will be focused on the tranny problems. After that Maxxie will have to wait here, in a snowbank, until I return from the Rio Dulce in Guatemala where I have to replace the exhaust system in my Mercedes OM636 (180D) now there is a real old one!!! powered sailboat "Whitecap". The OM636 has worked fine since 1973, it is just all the stuff made in America bolted to it like alternators transmissions etc...
Again Thanks for the help
Dick (
www.whitecap-pei.com)