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Coolant Gauge not working 700

posted by  PorBrickMan on  Tue Nov 17 14:49 CST 2009
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last visit: Sun Apr 13 10:31 CST 2014
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The coolant gauge on an '88 744GLE I work on will work during warm up but then when up to temp drops to zero. I've replaced the thermostat three times and repeatedly bled the system to no avail. Any suggestions?
--
D '90 745T 229k, '88 744GLE 129k, '96 328i, '73 911T 100k+








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    Coolant Gauge not working 700

    posted by  trichard on  Wed Nov 18 10:43 CST 2009
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    last visit: Fri Oct 24 05:52 CST 2014
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    since the gauge works during warm up and then fails the problem is NOT the wiring or the gauge.

    the only variable left is the sensor. the likely fault is the quality of the connection of the wiring internally in the sensor BEFORE the signal reaches the harness connector.

    i think you will your problem disappear once you replace thre sensor.

    i have had this trouble on 940's.








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    Coolant Gauge not working 700

    posted by  aleekat on  Tue Nov 17 15:23 CST 2009
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    last visit: Fri Oct 24 13:19 CST 2014
    [RELATED]

    Gauge, sensor or wiring.
    --
    Post Back. That's whats makes this forum work.








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      Coolant Gauge not working 700

      posted by  PorBrickMan on  Tue Nov 17 16:14 CST 2009
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      last visit: Sun Apr 13 10:31 CST 2014
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      Where's the sensor? Is it in the radiator or on the block? Wiring to both looks good. I've seen a couple of other 740's with dead coolant gauges. Any way to test the gauge in the instrument cluster?
      --
      D '90 745T 229k, '88 744GLE 129k, '96 328i, '73 911T 100k+








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        Coolant Gauge not working 700

        posted by  Aaron244DL on  Wed Nov 18 07:52 CST 2009
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        last visit: Mon Feb 8 04:51 CST 2010
        [RELATED]

        I have a '90, but I think they are the same. The gauge has its own sensor. It's in the engine block under the intake manifold, right by the knock sensor. Make sure you check the wiring before replacing the sensor.







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