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389 Coolant Sensor

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by dirthaller, Oct 17, 2023.

  1. Oct 17, 2023 #1
    dirthaller

    dirthaller Road Train Member

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    When my Peterbilt 389 Coolant sensor went out about 250,000 miles ago, I simply unplugged the sensor at the tank and the buzzer went off. It just threw a code until I replaced it (I put a whole new tank on it).
    Today, the low coolant buzzer went off……coolant plenty full…..so I unplugged it and the buzzer won’t go off. I tried the paperclip trick too. Nothing makes the buzzer go off.
     
    dirthaller, Oct 17, 2023
    dirthaller, Oct 17, 2023
    #1
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  3. Oct 17, 2023 #2
    Goodysnap

    Goodysnap Road Train Member

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    Pull test the wires within the first foot of the harness. Broken copper inside the insulation is common up near the tank due to vibration. Spread pins at the sensor connector are also common.
     
    Goodysnap, Oct 17, 2023
    Goodysnap, Oct 17, 2023
    #2
    dirthaller Thanks this.
  4. Oct 17, 2023 #3
    M22 rockcrusher

    M22 rockcrusher Road Train Member

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    Get a telescoping magnet and put down the tank sometimes the float sticks even new one's there's enough metal there to unstick it its worth a try worked on my 579.
     
    M22 rockcrusher, Oct 17, 2023
    M22 rockcrusher, Oct 17, 2023
    #3
    dirthaller Thanks this.
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