Trouble in cooling system

Discussion in 'Freightliner Forum' started by joshomatic, Jan 18, 2022.

  1. joshomatic

    joshomatic Bobtail Member

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    Jan 18, 2022
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    Hello all, have an issue with my trucks cooling system.

    It's a 2013 Cascadia DD15.
    Last 8 of VIN: DSBZ6783
    720k miles

    It looks like a pressure buildup in the cooling system. From the moment I start it up there is a lot coolant rushing in from the egr valve into the reservoir.

    With the old radiator cap on, coolant will gradually overflow the tank and leak out the top.

    I replaced the cap with a new one and the level stays even in the tank, however hoses are starting to bust when the new cap is on.

    In the lead up to this, I've had the egr cooler replaced and had blown head gasket. Did an inframe, the pressure issue persists.

    Using an exhaust gas test kit, it doesn't look like any gases are getting into the coolant.

    At this point I'm tapped out and am having to wait on going back to a mechanic. Just trying to get some ideas to look at.

    Any suggestions would be appreciated.
     
    truckdriver31 Thanks this.
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  3. truckdriver31

    truckdriver31 Road Train Member

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    hope u like head jobs.
     
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  4. Mike250rs

    Mike250rs Heavy Load Member

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    when was the last time you replaced the air compressor?
     
  5. joshomatic

    joshomatic Bobtail Member

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    Jan 18, 2022
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    Replaced it just before everything else started, however, doesn't seem to be any difference if the compressor is running or not
     
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  6. Mike250rs

    Mike250rs Heavy Load Member

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    sometimes they will take a dump internally and pressurize the coolant system.
     
  7. flood

    flood Road Train Member

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    2 things.
    Injector cups..
    Compressor
    Both will put high pressure air in the coolant system
     
  8. msh

    msh Light Load Member

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    Jul 18, 2021
    Los Angeles, CA
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    we had a truck with similar issue. We paid 400 and installed oem coolant reservoir. the problem disappeared
     
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  9. joshomatic

    joshomatic Bobtail Member

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    Jan 18, 2022
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    I have recently had ours replaced as well, however, it was prior to all the other stuff that went down. The overflow portion is filling up, so, that could mean it is broken again. Just feels like whack a mole at this point without finding a cause.
     
  10. msh

    msh Light Load Member

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    Jul 18, 2021
    Los Angeles, CA
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  11. joshomatic

    joshomatic Bobtail Member

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    Jan 18, 2022
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    Well, I brought the truck to the shop today. Talking through with the mechanic, their first inclination went to the air compressor, but they're gonna dig in to rule out all possibilities. We'll see!
     
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