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Thermostat temp - problem? 700 1991

posted by  Bonzo on  Tue Mar 20 12:05 CST 2018
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last visit: Fri Aug 29 15:50 CST 2014
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I don't recall a problem with this on any of my 240's, but on my 740 the temp only goes up to about 1/3, not the middle (for years now). So this winter (NE Ohio) I put a piece of cardboard in front of radiator and it kept in the middle pretty good. So with spring coming up soon (wait! today!), I took out the cardboard. Should I replace my thermostat with a hotter one? If so, which works best for my climate? Thanks.








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    Thermostat temp - problem? 700 1991

    posted by  spasske on  Tue Mar 27 07:19 CST 2018
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    last visit: Thu Oct 23 10:11 CST 2014
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    Definitely sounds like the thermostat. They are a cheap maintenance item that is easy to replace.

    Should also improve your MPG as well.
    --
    Paul NW Indiana '90 745 turbo 145 K








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    Thermostat temp - problem? 700 1991

    posted by  james_a_sousa on  Thu Mar 22 17:27 CST 2018
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    last visit: Thu Oct 23 18:51 CST 2014
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    How long have you owned the 740?

    Our '90 744 TI did the same thing - our NA '90 745 was fine.

    When I opened the thermostat housing, I found that the thermostat had been pushed open and cocked to stay open - then I found that the electric fan was siezed!

    I had two 850 thermostats fail open the cars would warm up, then cool on the highway.







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    Thermostat temp - problem? 700 1991

    posted by  KlausC on  Tue Mar 20 19:22 CST 2018
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    last visit: Fri Oct 24 10:15 CST 2014
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    Before you replace the thermostat with an OE version, get an infrared thermometer and check the temp of the thermostat housing when the engine is hot. Don't want to throw money at the engine bay when the fault is in the instrument cluster.

    90C sounds about right.
    --
    Keeping it running is better than buying new








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      Thermostat temp - testing 700 1991

      posted by  Bonzo on  Sat Mar 24 12:33 CST 2018
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      last visit: Fri Aug 29 15:50 CST 2014
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      I actually never heard of an infrared thermometer, may actually get one (good excuse to buy another tool!). I guess I could also pinpoint all my cold air leaks in my old house. Long time ago I took out my thermostat, hung it in a pot of water on my stove with a kitchen thermometer, turned on the heat, and just watched at what temp it opened.







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