2011 Mack CXU using coolant but no leaks?

Discussion in 'Mack Forum' started by A Keffer Inc., Jun 4, 2021.

  1. A Keffer Inc.

    A Keffer Inc. Bobtail Member

    27
    7
    Aug 5, 2010
    Moyock, NC
    0
    Hello. I seem to have a strange phenomenon with my truck getting low on coolant and needing to top off twice a day, but I can't seem to find any leaks anywhere. No oil in coolant, or coolant in oil, exhaust pipe is dry and no residue in the pipe. Coolant doesn't appear to be blowing off out of either caps on the tank.

    The only place I can't check is if transmission oil and coolant are mixing at the radiator, but the trans needs to cool off before I can pull the plug and check. No leaks on the emissions hoses / lines either.

    The only thing that I think it may be, if the coolant is probably 80% water right now from fixing a previous leak earlier last weekend. Could too high of water to coolant ratio make coolant play tricks on you?

    Engine is a MP8 455hp. Thanks
     
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  3. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,602
    1,476
    Jun 14, 2009
    romulus,mi
    0
    You need to have it pressure tested with the proper tooling.
     
  4. A Keffer Inc.

    A Keffer Inc. Bobtail Member

    27
    7
    Aug 5, 2010
    Moyock, NC
    0
    Yep, I think it's likely an injector cup now. The truck was hard to start this morning.
     
  5. Chrisjohn97

    Chrisjohn97 Bobtail Member

    16
    4
    Aug 12, 2021
    0
    If a cup is leaking you would more thank likely have coolant in the oil but not definitely. We have a good amount of Mack gu’s in our fleet. They’re prone to coolant leaks and many of them are hard to find. What happens often is the coolant sprays on the block and evaporates off immediately leaving no trace. Check behind your egr. There’s a pipe behind it for coolant. We’ve had 2 trucks leak there and they both sprayed on the block. And we run 100% water in the coolant system in the summer for a couple days when we clean the coolant system out, coolant to water ratio won’t do anything weird except freeze in the winter
     
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