Water level

Discussion in 'Ask An Owner Operator' started by Adriantx, Sep 23, 2021.

  1. Adriantx

    Adriantx Light Load Member

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    Dose anyone know if water level should drop when turning on truck after its been off for 10hrs or more hrs?
    My trucks water level drops when turning on truck after a few minutes as it's getting warmer it levels out without me adding coolent is this normal I have a cummins isx15?
     
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  3. Spyro2112

    Spyro2112 Medium Load Member

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  4. Spyro2112

    Spyro2112 Medium Load Member

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    Thermostat may b stuck open
     
  5. Adriantx

    Adriantx Light Load Member

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    Just changed it?
     
  6. Rideandrepair

    Rideandrepair Road Train Member

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    It’s probably normal. Thermostats are closed and coolant runs through the bypass back to waterpump. Once they open it drops, temporarily as it goes into radiator, then from heat expansion eventually comes back up. I can only guess. Not familiar with the newer engines, but I think they’re designed to run under higher pressure to keep temps down. Being a closed system under more pressure, would make sense. Same way with newer cars vs older ones. Hopefully someone with the exact set up will chime in.
     
  7. Ridgeline

    Ridgeline Road Train Member

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    What do you mean drops?

    In the expansion tank?

    how much?
     
  8. Adriantx

    Adriantx Light Load Member

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    Dec 29, 2018
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    In Reservoir, level gose from max full level to min level then after 10min it's back to max full level
     
  9. uncleal13

    uncleal13 Road Train Member

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    Normal. Suction of water pump pulls it down. Heat expansion makes it come back up.
     
    lester Thanks this.
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