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What is this?

Discussion in 'Ask An Owner Operator' started by RunningAces, Dec 28, 2021.

  1. Dec 28, 2021 #1
    RunningAces

    RunningAces Road Train Member

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    My 2017 t680 with a isx15 doesn't have a coolant filter and I am just over 500k miles on it now. I had the truck in the shop to do a few things and had them do a coolant change or radiator flush. When I got the truck back it had this thing on it off that cap I didn't notice until I got it back. I'm sure it's simple but I've never seen one and don't know what the point of it is?
     

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    RunningAces, Dec 28, 2021
    RunningAces, Dec 28, 2021
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  3. Dec 28, 2021 #2
    lester

    lester Midwest's #1 Feed Hauler

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    Looks to me like they just plugged your over flow hose. Maybe to pressurize cooling system to purge it or just pressure check for leaks.

    There should be a hose attached there that goes somewhere I would imagine.
     
    lester, Dec 28, 2021
    lester, Dec 28, 2021
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  4. Dec 28, 2021 #3
    RunningAces

    RunningAces Road Train Member

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    Should that be plugged up like that or should it be open since it's an overflow?
     
    RunningAces, Dec 28, 2021
    RunningAces, Dec 28, 2021
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  5. Dec 28, 2021 #4
    AModelCat

    AModelCat Road Train Member

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    I would say it should be left open and routed down to the bottom of the rad.

    That bolt will never seal it off 100% anyways.
     
    AModelCat, Dec 28, 2021
    AModelCat, Dec 28, 2021
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  7. Dec 28, 2021 #5
    Rideandrepair

    Rideandrepair Road Train Member

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    Maybe it’s their test cap. Your caps back at the shop. Someone’s tool is on your Truck. My guess.
     
    Rideandrepair, Dec 28, 2021
    Rideandrepair, Dec 28, 2021
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  8. Dec 29, 2021 #6
    Flint1

    Flint1 Road Train Member

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    More then likely they used a vac n fill to fill the coolant system. That vent on the side is the cap for allowing excess pressure or vacuum to dealt with during normal warm up expansion and cool down contraction.
    The cap on top is just a cap. The vac n fill (air lift) etc won't work unless that vent is capped.
    That is a shop tool per se. I'd remove and discard it. There may have been a hose attached to route coolant overflow to the bottom...
    Ask the shop...
     
    Last edited: Dec 29, 2021
    Flint1, Dec 29, 2021
    Flint1, Dec 29, 2021
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