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Cummins X15 Heater Core Fitting

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Midwest Trucker, Jan 13, 2020.

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  1. Jan 13, 2020 #1
    Midwest Trucker

    Midwest Trucker Road Train Member

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    Where the coolant comes out of the heater core, there is a plastic fitting. Between 150,000 to 200,000 miles this plastic fitting breaks off blowing all your coolant out. Do yourself a favor and replace it now with a metal one like it should be in the first place.

    When it breaks it’ll be on a Sunday when no parts are available costing you 2 road side charges plus a repower on a hot load.
     
    Midwest Trucker, Jan 13, 2020
    Midwest Trucker, Jan 13, 2020
    #1
    jsnell and Brettj3876 Thank this.
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  3. Jan 13, 2020 #2
    JonJon78

    JonJon78 Road Train Member

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    Take a picture of what your talking about please
     
    JonJon78, Jan 13, 2020
    JonJon78, Jan 13, 2020
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    D.Tibbitt and Roberts450 Thank this.
  4. Jan 13, 2020 #3
    Goodysnap

    Goodysnap Road Train Member

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    Plastic quick connect fittings were used on Paccar and Cummins engines on Pete's and KW. RR of the engine to heater core supply.

    Plastic fittings are obsolete and updated to a brass nipple available in 5/8" and 3/4" nipple.
     
    Goodysnap, Jan 13, 2020
    Goodysnap, Jan 13, 2020
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  5. Jan 13, 2020 #4
    Midwest Trucker

    Midwest Trucker Road Train Member

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    Here you go.

    45D415E9-1876-48B2-A32E-590730183493.jpeg 6DBAD623-E510-48DD-B2E2-EFB6AA6AA313.jpeg

    This was on my 2018 T680. I checked the 2019 and both 2020’s and they have the plastic as well. So, updating them all to the metal as it’ll just happen again. This really should be a recall IMO. My contact at KW said he sees this happen every week. Hope this information helps someone.
     
    Midwest Trucker, Jan 13, 2020
    Midwest Trucker, Jan 13, 2020
    #4
    Northern70, jsnell, Flint1 and 1 other person Thank this.
  7. Jan 13, 2020 #5
    JonJon78

    JonJon78 Road Train Member

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    Does the coolant need to be drained prior to replacing and do you have part number for replacement fitting?
     
    JonJon78, Jan 13, 2020
    JonJon78, Jan 13, 2020
    #5
  8. Jan 13, 2020 #6
    loudtom

    loudtom Road Train Member

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    My Volvo has plastic barbs on both ends of the two lines that go from the coolant filter to near the DEF doser valve. So far, 3 of the 4 have broken. I'm not sure if they make an upgraded part, or if I can change it to a better material. My solution so far has been to slip a larger diameter hose to join the broken ends back together and clamping them down. The worst part is that it's pretty much the lowest point on the truck, so almost all of the coolant gets lost when one breaks.
     
    loudtom, Jan 13, 2020
    loudtom, Jan 13, 2020
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    Midwest Trucker Thanks this.
  9. Jan 13, 2020 #7
    Roberts450

    Roberts450 Road Train Member

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    Guess the plastic fittings are used on the cheap trucks where the dealers dont order the shutoff valves. My 2018 pete with the x15 has shutoff valves like it’s supposed to have.
     
    Roberts450, Jan 13, 2020
    Roberts450, Jan 13, 2020
    #7
  10. Jan 13, 2020 #8
    Midwest Trucker

    Midwest Trucker Road Train Member

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    That’s sort of a crappy thing to say that my truck is cheap just because it doesn’t have a shut off valve. What’s cheap is that Cummins decided to use a plastic fitting.

    You have no idea the specs of my truck.
     
    Midwest Trucker, Jan 13, 2020
    Midwest Trucker, Jan 13, 2020
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    jsnell Thanks this.
  11. Jan 13, 2020 #9
    Goodysnap

    Goodysnap Road Train Member

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    This part is not supplied by Cummins but the truck manufacturer.

    I agree crappy, nonetheless.

    Quick connects are used for one reason, and one reason only.............save time on the assembly line.
     
    Goodysnap, Jan 13, 2020
    Goodysnap, Jan 13, 2020
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  12. Jan 13, 2020 #10
    Ridgeline

    Ridgeline Road Train Member

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    It ain't Cummings, it is the truck manufacturer.

    Edit ... didn't see the post above before I posted.
     
    Ridgeline, Jan 13, 2020
    Ridgeline, Jan 13, 2020
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    Midwest Trucker Thanks this.
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