Well I guess I failed to fully report my test. Once I got the a/c to cycle on by jumping the power from the battery directly to the mono valve, I did hook up my multimeter to the two pins on the valve - no volt reading with a/c setting on full cold or full heat, but I guess if the push-button unit is not sending a signal that's what I should expect. I thank you for all your help. I'll buy a new or rebuilt unit pretty soon, but since the thing is shot, I think I'll pull it apart to see if I can solder any loose connnections. Can't hurt it any more, and if I don't look busy on my car today, the wife is going to put me to work in the yard.

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Dave
1995 C280
1999 Triumph Daytona 955I - my speed fix.
1982 300TD - Gone, but not forgotten.