Have a problem with our '86 300sdl. Temperature gauge stays at around 40-50 degrees only. Up to the second line on the gauge or less.... Heater is really weak for some reason. Even if you turn the setting to the red mark... The blower works. Just wouldn't blow hot air....Having a hard especially with the cold season. Any help will be most appreciated....

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'76 300D
'82 230CE
'84 300DT
'91 300D 2.5
'86 300D 5 speed
'86 250D 5 speed
'90 300E 24v
'88 560SEC
300TE euro 5 speed
91 350SD
http://i75.photobucket.com/albums/i3...d6605222-1.jpg

Absolutely classic symptoms of a failed engine thermostat. Get a new one, and preferably at the dealer or here at FastLane, and you'll fix both problems.

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Steve
'93 400E

Ah yes winter has arrived.
My wife picked me up at the airport tonight in my daughters 240D. Its 30 degrees here tonight and the cars operating temp would not go above 55 degrees. And the heat was weak.
A classic thermostat failure in the open mode. So time for a new one.

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car