Peterbilt coolant loss

Discussion in 'Ask An Owner Operator' started by acisner6, Jun 11, 2021.

  1. acisner6

    acisner6 Bobtail Member

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    May 10, 2016
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    I have a 2014 peterbilt cummins engine 900k miles
    It suddenly started losing coolant it went from not losing anything to losing about a gallon a day. No leaks under truck nothing coming from exhaust that I can see. Oil from dipstick looks good but I took off oil fill cap with engine running there’s a lot steam coming out. Anybody have this happen or have an idea what it might be.
     
    Last edited: Jun 11, 2021
    feldsforever Thanks this.
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  3. HillbillyDeluxeTruck

    HillbillyDeluxeTruck Road Train Member

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    EGR coolers are known culprits. A sunk liner can be another cause. Cracked head yet another.
     
  4. Rideandrepair

    Rideandrepair Road Train Member

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    Hopefully it’s the egr cooler. Not a pinhole in a piston liner. Must be going out the exhaust, if it’s not in the oil, or on the ground. Only other place I know of would be a transmission cooler. If you have the coolant type. It could be going into the transmission. Usually it’s just a small amount. I doubt it’s that. Easy to check though. Take the fill plug out, see if it’s way overfilled.
     
    spindrift Thanks this.
  5. mudflap77

    mudflap77 Medium Load Member

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    Oct 11, 2010
    South western Ontario
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    I recently had the same issue. I wasn't losing that much. But mine was leaking from one of the 3/8" heater hose that supplies coolant to the DEF dose. It was dripping on to the exhaust so it never left a puddle. The only indication was the hose collected some dust. On the 579 w/sleeper there is two 6" long hoses collected to the sleeper hvac.
     
    feldsforever and Rideandrepair Thank this.
  6. bad-luck

    bad-luck Road Train Member

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    Baltimore, Maryland
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    Have EGR cooler checked
     
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