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Thread: Coolant Level Sensor Test

  1. #1
    Join Date
    Sep 2013
    Location
    Adelaide
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    27

    Coolant Level Sensor Test

    Car is a 92 classic


    I've got an issue with the low coolant warning light being constantly on.

    Coolant levels are fine.

    Is there any way to test if the sensor in the expansion tank is the issue?

    so far, I've tested by tying the float in the raised position, but this doesn't make the light go off.

    Thanks in advance.

  2. #2
    Join Date
    May 2009
    Location
    St Agnes, SA
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    427
    You could use an ohm meter and move the float to see if it has an effect or change in ohms. Chances are it has failed. Last time I checked they were about $30.

    Left field though; the light on mine flashes even though the level sensor tested ok. There is a power transformer or reducer on the back of the instrument display that is in the circuit that I am very sure is faulty, but can't for the life of me find a replacement. That is also somewhere else to check.
    '15 Discovery 4 HSE- New family bus and the kids like it!
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  3. #3
    Join Date
    Jan 1970
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    Avoca Beach
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    11,744
    The sender is just a reed switch, however there is a difference that I will try to explain and remember.

    AFAIR from ten years ago the switch is positive when inactive and open circuit when active ( water low), which is the opposite of most reed switches.
    The display is controlled by a sub processor at the back of the dash which converts that to light on when the reed switch is low so it is not a simple relay.

    Regards Philip A.

  4. #4
    Join Date
    Sep 2013
    Location
    Adelaide
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    27
    If I take both leads off the sensor (open circuit) should that cause the dash light to turn off?

  5. #5
    350RRC is offline ChatterBox Silver Subscriber
    Join Date
    Mar 2008
    Location
    Bellarine Peninsula, Brackistan
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    Quote Originally Posted by Danro View Post
    If I take both leads off the sensor (open circuit) should that cause the dash light to turn off?
    Take the globe out of the dash.............that'll fix it every time.

    DL

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