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Old 05-09-2003, 10:17 PM
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overheating 300tdt

My 87 300tdt overheats when stopped in traffic. I have replaced thermostat twice, no change. Water pump is 2 yrs old. If I am stopped in traffic in the winter, the heat stops until I start moving, then starts again. if I am stopped in summer, I have to rev engine to 2-3,000 rpms before temp starts to go down. Does anyone have any ideas? I also replaced the clutch fan, no change!
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Old 05-09-2003, 11:31 PM
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Join Date: Mar 2001
Posts: 326
Depending on your definition of overheating (there are some on this forum that panic if the temp goes to 90C), and assuming the coolant temp comes back to normal when you begin moving, you auxilary fan may not be working and/or the radiator has become clogged with bugs/debris over the years.

As far as losing heat in the winter the auxilary water pump is probably not working.
Scott Diener
89 300E
93 300E
92 Volvo 740 Wagon aka "Mutt mover"
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Old 05-09-2003, 11:51 PM
dmorrison's Avatar
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Join Date: Dec 2002
Location: Colleyville, Texas
Posts: 2,694
My 82 300TD did this.
Check the radiator. If it is origanal it may be collapsing. If you have a thermometer, IR would be the best. Check the temp of the radiator at various places on it. Mine had the center section collapsing and you could "feel" a cooler spot in the center. If its this then its time for a new radiator. If its original then after 16 years this could be the problem.

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
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