Water temp guage not working

Discussion in 'Trucks [ Eighteen Wheelers ]' started by ready2truck, Jun 18, 2021.

  1. Jun 18, 2021 #1
    ready2truck

    ready2truck Medium Load Member

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    05 Freightliner water temperature not working. Shop said when they plugged in the ecm it showed water temp. When I ground the guage out the needle will max out. Could the guage still be bad? What should I test next?
     
    ready2truck, Jun 18, 2021
    ready2truck, Jun 18, 2021
    #1
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  3. Jun 18, 2021 #2
    AModelCat

    AModelCat Road Train Member

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    You ground the gauge it pegs out and with the wire off it goes back to zero?

    I'd suspect the sensor is toast. Most trucks of that era had a temperature sensor for the ECM and a seperate one for the gauge.
     
    AModelCat, Jun 18, 2021
    AModelCat, Jun 18, 2021
    #2
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  4. Jun 18, 2021 #3
    ready2truck

    ready2truck Medium Load Member

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    Yeah it maxes out then goes back to zero. Do you know the location of the sensors?
    It's a c15 acert
     
    ready2truck, Jun 18, 2021
    ready2truck, Jun 18, 2021
    #3
  5. Jun 18, 2021 #4
    Roberts450

    Roberts450 Road Train Member

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    Both should be in the thermostat housing which is top right/center of the engine just under the upper rad hose.
     
    Roberts450, Jun 18, 2021
    Roberts450, Jun 18, 2021
    #4
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