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Old 02-16-2002, 11:31 PM
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Servo or Temp Dial

Have a '79 300 SD. Can now only get cool air. Previously had a cracked servo unit and could only get hot air. Replaced a bad aux heater water pump that was bad. Have put in two different used servo units from junk yards, but neither are able to switch to hot air. Is there a way to determine (for an absolute novice) if the temperature dial is working? At this time of year hot air would be better. Any way to manually change the servo to a heat setting? Any easy way to determine if the servo units are ok? Help!!
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Old 02-17-2002, 10:15 PM
unkl300d's Avatar
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Join Date: Jul 1999
Location: San Francisco, Ca
Posts: 2,207
Chrysler's revenge..........KLIMA

There is a small cylindrical pump that serves the servo (that's a joke sonny!),
Anyway, try testing this as well.
When I had the servo replaced on my w123, I could not get hot
air. After a NEW one was installed, the heat came back on.
My pump was o.k.

Do a search on the archives, it is all there
1979 300D 199 K miles
1995 C280 95 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles
1979 240D 140Kmiles (bought for parents) *SOLD.
1989 300SE 148 K miles *SOLD
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