we'll definitely need to know what year and model you're driving. 60c-80c sounds about right to me. no heat issues are well documented in the forum archives. most likely a problem with the monovalve i guess.

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"