My 240 D does not loose any coolant. It gets up to temperature perfectly, and has no issues regulating temperature and staying at the right operating temp. AC system works well, AC blows COLD, heat blows hot. I dont seem to be able to get any air out of the two outboard dash vents, but that is another thing for another time.

Car is mechanically perfect. No smells of any type.

When I turn up the heat in the car, I get a pretty good fogging of the windshield. It does this without fail, AC engaged or not. Eventually it goes away, but it happens every time.

What gives? I dont think it is a bad heater core, because I smell no antifreeze and loose no antifreeze.

Could it be AC condensation on the hot heater core flashing up as steam?

My 240 has a fully manual system.

Thanks!

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)