2017 Freightliner coolant leak

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by International2020, May 14, 2024.

  1. International2020

    International2020 Bobtail Member

    41
    8
    Dec 17, 2023
    South Carolina
    0
    So I have a 2017 Freightliner Cascadia and I have a coolant leak. I’ve done a coolant pressure test and everything else but mechanics cannot find a leak anywhere. Any ideas on where the hell it’s going I have to put like a gallon in maybe every week and a half two weeks.
     
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  3. loudtom

    loudtom Road Train Member

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    2,665
    Aug 26, 2016
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    Check EGR cooler



    If you don't have Detroit motor, find a Cummins video.
     
    Rideandrepair Thanks this.
  4. International2020

    International2020 Bobtail Member

    41
    8
    Dec 17, 2023
    South Carolina
    0
    Hmm ok. There’s probably what it is
     
  5. Sm0kie

    Sm0kie Bobtail Member

    8
    3
    May 15, 2024
    0
    Pull the mixer pipe (going into intake elbow) and see if it's wet for egr cooler. As previously said. 13mm, 4 bolts, then either a 7mm or 8mm for hose clamp.
    Check oil and make sure it doesn't look like chocolate milk.
    Check fuel and make sure it's not cloudy/separating.
    Check coolant pipes under cab going to bunk heater core. Specifically where the plastic hold down brackets go over them. And make sure bunk heater core isn't leaking.
    Check def tank. Should be clear. (Very rare to have coolant leak into def, usually it's other way around)
    Make sure it's not leaking down onto turbo/exhaust and evaporating.
     
    biopure22 Thanks this.
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