Losing coolant, not running hot

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

  1. cuzzin it

    cuzzin it Road Train Member

    2,964
    5,063
    Jan 19, 2008
    Berea, KY
    0
    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
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Antinomian

    Antinomian Road Train Member

    1,957
    3,010
    Feb 17, 2013
    0
    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.
     
  4. cuzzin it

    cuzzin it Road Train Member

    2,964
    5,063
    Jan 19, 2008
    Berea, KY
    0
    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..
     
    Rideandrepair and ducnut Thank this.
  5. Antinomian

    Antinomian Road Train Member

    1,957
    3,010
    Feb 17, 2013
    0
    But you're seeing bubbles in the recovery tank? Pressure in the radiator can cause the radiator to fail and start leaking.
     
    Rideandrepair and cuzzin it Thank this.
  6. cuzzin it

    cuzzin it Road Train Member

    2,964
    5,063
    Jan 19, 2008
    Berea, KY
    0
    When engine running
     
    Rideandrepair Thanks this.
  7. cuzzin it

    cuzzin it Road Train Member

    2,964
    5,063
    Jan 19, 2008
    Berea, KY
    0
    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
     
    Rideandrepair and ducnut Thank this.
  8. Heavyd

    Heavyd Road Train Member

    7,652
    6,068
    Feb 4, 2009
    0
    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.
     
    Rideandrepair and cuzzin it Thank this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.