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Thread: Temperature gauge not working.

  1. #1
    Senior Member grouch's Avatar
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    Temperature gauge not working.

    I'm trying to figure out why my temperature gauge isn't working very often. It sometimes works, when it feels like it, but not all the time. The cooling system is clean and full, I've replaced both sending units for the computer and gauge. It quit working once when I went to the store. I've been driving down the road and it would start to work. Later, when I start the car, it doesn't do anything.
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  2. #2
    Ridin Dirty dom's Avatar
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    When the gauge is not working, and vehicle has had enough time to warm up, do you ever turn on the heater and feel if it's blowing normal hot?

    Just to confirm it is in fact the gauge/sensor/wiring problem and not the thermostat wide open.

    "Tutto nello Stato, niente al di fuori dello Stato, nulla contro lo Stato "
    -Mussolini
    All within the state, nothing outside the state, nothing against the state.

  3. #3
    Senior Member grouch's Avatar
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    Quote Originally Posted by dom View Post
    When the gauge is not working, and vehicle has had enough time to warm up, do you ever turn on the heater and feel if it's blowing normal hot?

    Just to confirm it is in fact the gauge/sensor/wiring problem and not the thermostat wide open.

    It's a fairly new thermostat. I use FailSafe units and they will stay open when they fail. I'm getting heat, it makes no difference if the gauge is working or not. I'm sure the problem is electrical, I just am trying to track down where to look.
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  4. #4
    Ridin Dirty dom's Avatar
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    What is the year, make, and model of the unit?

    "Tutto nello Stato, niente al di fuori dello Stato, nulla contro lo Stato "
    -Mussolini
    All within the state, nothing outside the state, nothing against the state.

  5. #5
    Senior Member DonTom's Avatar
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    Quote Originally Posted by grouch View Post
    I'm trying to figure out why my temperature gauge isn't working very often. It sometimes works, when it feels like it, but not all the time. The cooling system is clean and full, I've replaced both sending units for the computer and gauge. It quit working once when I went to the store. I've been driving down the road and it would start to work. Later, when I start the car, it doesn't do anything.
    Is there one of those film type circuits behind the gauges? I have seen those go intermittent.

    -Don-

  6. #6
    Senior Member grouch's Avatar
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    Quote Originally Posted by dom View Post
    What is the year, make, and model of the unit?


    It's a 1998 Ford Taurus SE. I suspect a loose wire somewhere but neck injury keeps me from getting down in there to trace it easily.
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  7. #7
    Administrator Ken's Avatar
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    Quote Originally Posted by grouch View Post
    It's a 1998 Ford Taurus SE. I suspect a loose wire somewhere but neck injury keeps me from getting down in there to trace it easily.
    The symptoms you describe are typical of a loose/corroded connection, Grouch. On a 98 Ford, I would tend towards the possibility of a corroded connector somewhere in the circuit. If so, as you obviously know, it is a track and clean task that can take a few minutes or several hours. I have, unfortunately, no idea how many connectors there are between the sender and the dash circuit panel.

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  8. #8
    Senior Member DonTom's Avatar
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    Quote Originally Posted by grouch View Post
    It's a fairly new thermostat. I use FailSafe units and they will stay open when they fail. I'm getting heat, it makes no difference if the gauge is working or not. I'm sure the problem is electrical, I just am trying to track down where to look.
    I used a Failsafe ONCE. In failed in 50 miles and stayed stuck OPEN. Replace it with a NORMAL thermostat!

    Don't be so sure it's an electrical problem! At least not yet!

    -Don-

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