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water temp gauge 200 1989

posted by  ACVOLVO on  Thu May 28 01:05 CST 2009
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last visit: Fri Sep 19 13:15 CST 2014
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I just installed the IPD temp. compensator bypass on my 89 240.Its funny since I bypassed the compensator circuit board the temp gauge, that use to ussally read around halfway now reads about an 1/8th inch from the red or warning/danger zone. I wonder if origanally the engineers screwed up with there design, and instead of rectifing the problem they just added this circuit. I could not trust the gauge any more so I installed a cyberdyne digital read out water temp gauge.I noticed on average that My gauge reads any where from 189 degrees farenh. to 200. I left my orignal gauge hooked up, and it reads 1/8th inch from the red zone. I was wondering if any one knows the engine water temperture that is considered not safe for the engine?








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    water temp gauge 200 1989

    uid 27's pic
    posted by  Art Benstein on  Thu May 28 06:00 CST 2009
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    last visit: Fri Oct 17 20:10 CST 2014
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    Hi there,

    I agree the temperature is probably safe. I would borrow an IR thermometer to double check at the head, if you did indeed install your aftermarket gauge sender at the bottom of the block. I would wonder how quickly an overheat condition would be recognized from down in the sediment behind the block drain valve.

    Once you bypass the Temp Faker, the stock gauge is most likely telling you the truth. If it warms up normally to that point you believe is too high, the job you did installing the bypass is OK. Again, use a non-contact thermometer to verify.

    Also, you can verify your 10-Volt regulator by simply removing the yellow wire from the gauge sender and checking the voltage there.






    --
    Art Benstein near Baltimore

    Mistakes are the portals of discovery. -James Joyce








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      16 Volts, Top of Red? 200 1989

      uid 40935's pic
      posted by  Goatman on  Thu May 28 06:08 CST 2009
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      last visit: Sat Jul 26 20:30 CST 2014
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        16 Volts, Top of Red? 200 1989

        uid 40935's pic
        posted by  Goatman on  Thu May 28 06:09 CST 2009
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        last visit: Sat Jul 26 20:30 CST 2014
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        Hello,


        I see that you've made the input of the temp gauge 16 Volts for the top of the red zone. How was the value obtained?


        Goatman








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          16 Volts, Top of Red? 200 1989

          posted by  ACVOLVO on  Thu May 28 10:42 CST 2009
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          last visit: Fri Sep 19 13:15 CST 2014
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          Goatman, you are correct that the new thermastate comes out to around 195 degrees faren. I do have the bypass hooked from pin #1 to pin #3. I would really be interested how this compensator circuit works and the real reason it was designed and installed.








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          16 Volts, Top of Red? 200 1989

          uid 27's pic
          posted by  Art Benstein on  Thu May 28 06:21 CST 2009
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          last visit: Fri Oct 17 20:10 CST 2014
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          You'll have to refer to my equivalent circuit sketch at the top to make sense of the notes where the current to the gauge heater is limited by a fixed resistor. The purpose here (done years ago) was to compare the effect of the compensation board's comparators dumping real values into three buckets. To convert to actual sensor temp, the standard gauge sender resistance chart could be applied using the standard 10V stabilized gauge source, but the gauges themselves are adjustable.
          --
          Art Benstein near Baltimore

          Always keep your words soft and sweet, just in case you have to eat them.







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            16 Volts, Top of Red? 200 1989

            posted by  ACVOLVO on  Thu May 28 10:37 CST 2009
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            Art, I do not totally understand your message, but I am very interested. I am wondering why the compensator circuit was designed? The standard answer that it was put there so the driver was not alarmed by varations, does not fly with me, according to the readings I get from actual gauge, to where the gauge actually falls with out the compensator circuit, using the IPD bypass from pin # 1 to # 3. So far the only explaination I can think of is that it was done to compensate for an engineering flaw.








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              Reason for temp comp board 200 1989

              uid 27's pic
              posted by  Art Benstein on  Thu May 28 11:01 CST 2009
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              last visit: Fri Oct 17 20:10 CST 2014
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              What sort of engineering flaw do you suppose? I believe it was put there to save money being chewed up by warranty concerns, from folks who mostly had lost their collective memories about gauges when idiot lights became the norm. The engineer that proposed it probably got a bonus based on the claim reduction. Are both your car and your daughter's car responding similarly?

              The bypass is a satisfactory fix for the majority of us, so if it was a flaw that was being covered, wouldn't we all be singing that tune?


              --
              Art Benstein near Baltimore

              We could learn a lot from crayons... Some are sharp, some are pretty and some are dull. Some have weird names, and all are different colors, but they all have to live in the same box.







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    water temp gauge 200 1989

    uid 34776's pic
    posted by  Ryan_R on  Thu May 28 05:18 CST 2009
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    last visit: Tue Sep 24 13:46 CST 2013
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    Well, the thermostat should be ~90*C, which translates to 194*F... so yer OK.

    Are you sure you did the IPD bypass correct? It's easy to get one end on the wrong pin.

    -Ryan
    --

    Athens, Ohio
    1987 245 DL 314k, Dog-mobile
    1990 245 DL 134k M47, E-codes, GT Sway Bars, GT Braces, Draco Wheels
    1991 745 GL 300k, Regina, 23/21mm Turbo Sway Bars






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