Never had this before. The weather just turned here so I have the heat on.

On my 1985 300d, at idle: more heat than I can use. Temp gauge shows normal.

When driving: faster I go, less heat I get (have to turn up temperature wheel to staywarm). But car runs a bit hot, around 100.

At highway speeds the heat wants to go away completely. Have to turn the wheel way up (and operating temp does drop a bit).

This is the opposite problem I had with all my SDs, in cold weather.....

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22