Well, thanks to Fast Lane, I received the monovalve (and a new hood star) in one day.

I have heat now, thank goodness.
Thanks again Mike for the needed repair instruction
web-link.

Denis

__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD