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  #1  
Old 10-17-2008, 02:54 PM
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Join Date: Jan 2008
Posts: 17
240D just purchased

I just bought a '81 240D ($500) which brings my collection of MB's to two. The automatic transmission is not shifting right and it is running cool (50C). I know that the thermostat is most likely causing the low temp, but I am curious if I can fix it. When I bought the car and drove home it ran at just above 80C, but the next morning it never came up to above 80 even on the highway. I am thinking that the thermostat is stuck open. Anyone got a tip.

The other issue is that the trans. is not shifting up to the next gear properly. I have to "help" it by taking my foot off the accelerator and then it up shifts. This maneuver is problematic in town. please send any tips or suggestions. Thank you.

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  #2  
Old 10-17-2008, 03:36 PM
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Location: Phoenix Arizona. Ex Durban R.S.A.
Posts: 6,104
Quote:
Originally Posted by biscuitbrad View Post
I just bought a '81 240D ($500) which brings my collection of MB's to two. The automatic transmission is not shifting right and it is running cool (50C). I know that the thermostat is most likely causing the low temp, but I am curious if I can fix it. When I bought the car and drove home it ran at just above 80C, but the next morning it never came up to above 80 even on the highway. I am thinking that the thermostat is stuck open. Anyone got a tip.

The other issue is that the trans. is not shifting up to the next gear properly. I have to "help" it by taking my foot off the accelerator and then it up shifts. This maneuver is problematic in town. please send any tips or suggestions. Thank you.
Dont even waste your time messing around with it. Put a new thermostat in.

- Peter.
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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S
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  #3  
Old 10-17-2008, 03:39 PM
dmorrison's Avatar
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Join Date: Dec 2002
Location: Colleyville, Texas
Posts: 2,695
New thermostat and do a search on setting your transmission vacuum. On the back of the injection pump is a vacuum control valve for the transmission shifting. If bad or not set right the tranny will not shift correctly. Also make sure all vacuum lines are properly connected and have a tight seal. Especially the one to the tranny.

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
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  #4  
Old 10-20-2008, 12:00 PM
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Posts: 17
thanks

Thanks for the tips.

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