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Losing coolant, not running hot

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by cuzzin it, Jun 16, 2024.

  1. Jun 16, 2024 #1
    cuzzin it

    cuzzin it Road Train Member

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    Berea, KY
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    My truck started pushing coolant out top of resevoir cap but isnt running hot. I see bubbles when its running coming up from bottom
    Detroit 13l
     
    cuzzin it, Jun 16, 2024
    cuzzin it, Jun 16, 2024
    #1
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  3. Jun 16, 2024 #2
    Antinomian

    Antinomian Road Train Member

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    Bad EGR cooler or cracked liner or a blown injector cup. If you aren't seeing fuel in the coolant recovery tank then it's most likely a bad EGR cooler.

    Check for coolant in the intake by removing the crossover pipe that goes between the intake and the EGR cooler.

    It can also be an internal failure in the air compressor, but I think that's not too common.
     
    Antinomian, Jun 16, 2024
    Antinomian, Jun 16, 2024
    #2
    Jordonh, Rideandrepair, ducnut and 1 other person Thank this.
  4. Jun 17, 2024 #3
    cuzzin it

    cuzzin it Road Train Member

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    Berea, KY
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    Now that ive looked at it good, ie: not side of highway. It seems that leak maybe top of radiator under resevior. The other truck (which was assembled right before it according to vin) did same thing. A couple thousand miles out of warranty. I get diagnosis in a few..
     
    cuzzin it, Jun 17, 2024
    cuzzin it, Jun 17, 2024
    #3
    Rideandrepair and ducnut Thank this.
  5. Jun 17, 2024 #4
    Antinomian

    Antinomian Road Train Member

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    But you're seeing bubbles in the recovery tank? Pressure in the radiator can cause the radiator to fail and start leaking.
     
    Antinomian, Jun 17, 2024
    Antinomian, Jun 17, 2024
    #4
    Rideandrepair and cuzzin it Thank this.
  7. Jun 17, 2024 #5
    cuzzin it

    cuzzin it Road Train Member

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    Jan 19, 2008
    Berea, KY
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    When engine running
     
    cuzzin it, Jun 17, 2024
    cuzzin it, Jun 17, 2024
    #5
    Rideandrepair Thanks this.
  8. Jun 17, 2024 #6
    cuzzin it

    cuzzin it Road Train Member

    3,466
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    Jan 19, 2008
    Berea, KY
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    Radiator at top of fins, bottom of top. So new radiator. Company bought 3 freightliners 5 years ago and radiators blew nearly same spot in all 3
     
    cuzzin it, Jun 17, 2024
    cuzzin it, Jun 17, 2024
    #6
    Rideandrepair and ducnut Thank this.
  9. Jun 17, 2024 #7
    Heavyd

    Heavyd Road Train Member

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    Air compressor or head gasket pressurizing the coolant. Have a combustion gas in coolant test done and isolate the cooling system from the air compressor and retest.
     
    Heavyd, Jun 17, 2024
    Heavyd, Jun 17, 2024
    #7
    Rideandrepair and cuzzin it Thank this.
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