Losing coolant and air bubbles.

Discussion in 'Ask An Owner Operator' started by Drsparkey3, Feb 8, 2020.

  1. Drsparkey3

    Drsparkey3 Bobtail Member

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    Have a 2012 DD15 losing coolant from top radiator cap, and have bubbles in the coolant tank. The bubbles appear to be coming from the hose on the EGR cooler. I'm hoping not an EGR cooler or head gasket. Any ideas?
     
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  3. Studebaker Hawk

    Studebaker Hawk Road Train Member

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    the cooling system is probably being pressurized by combustion gasses. Liner issue, head gasket, injectors are top contenders. Do not drive it any distance until you find out what the problem is. The longer you delay, the more damage will be done.
     
  4. Dave1837

    Dave1837 Heavy Load Member

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    Head gasket most likely. The coolant coming out of the rad cap is usually a tell tale sign
     
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  5. Rideandrepair

    Rideandrepair Road Train Member

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    I don’t know much about the egr cooler, but I think I’d prefer that over a bad head gasket. I do know, You can disconnect the discharge line from air compressor, carefull, loosen it first, let it bleed air out first, then remove it. Run Truck, if bubbles stop, air compressors bad. You also can pinch off the coolant hoses on air compressor, with flat vice grips, or loop one of the hoses, to the other on the block, isolating the air compressor. Either way should work. Don’t run it long without coolant circulating though, you’ll ruin a good compressor. Maybe there’s a way to isolate the egr cooler? I don’t know. But you want to eliminate any other potential source, before taking the head off. Usually a blown head gasket or cracked head, but not always.
     
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  6. mhyn

    mhyn Road Train Member

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    cracked or scored cylinder liner. … very common to pre 2014 engines... or sunk liner .
    if you will have cracked egr cooler you will have a coolant in egr pipes.. in the morning , before starting the engine, remove rubber hose that is on egr pipe and inspect inside...bad air compressor ? 0.1% of chances.
     
  7. baha

    baha Road Train Member

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    Run a sample of the oil that is in it now off to a mail order oil anil. place you can buy sample kits a truck parts store or T/stop, wait for it to come back to e/mail, If you know a shop that will pull the oil pan off and put pressure in rad. then they watch for coolant to drip out of liner pitting hole then turn eng. over 1/2 turn at a time till its been all the way around 1 turn, hope its just egr cooler bad letting ex. pressure in rad. most liners that have pitting will let oil get in rad.
     
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  8. JAD1024

    JAD1024 Light Load Member

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    What was your final outcome
     
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  9. Drsparkey3

    Drsparkey3 Bobtail Member

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    Believe it or not, nothing ever happened. Still running it as is. I had service work done to the APU and they must have gotten air in the system...
     
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  10. loudtom

    loudtom Road Train Member

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  11. Rideandrepair

    Rideandrepair Road Train Member

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    Best way to find out for sure is a pressure test. Test for leaks with 10 lbs of pressure, see if it holds. Start Truck, see if pressure builds. No more guessing.
     
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