Thank you very much 97E300D and also Kadams for your infos.

Seems like the appropriate heater valve formerly in brass is now supplied in synthetic material.

Do these things have a temperature rating, I wonder? Good to know in case I find a valve in a local store.

One other thing. is the valve placed only on one hose that by passes the servo while the other servo hose is then patched and made to run direct
but also bypassing the servo?
Thanks for your help.
Den

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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