The upper coolant pipe on a Cummins is one of those parts nobody thinks about until it dumps coolant on the highway. From the factory it is plastic, and plastic on top of a diesel engine lives a hard life. It heat cycles every single drive, it gets brittle, and eventually it splits. When it goes you lose coolant fast, the truck overheats, and if you do not catch it in time you are looking at a lot worse than a thirty dollar part.
The Worst One: The 2013 to 2015 Dual Radiator Y-Pipe
The 2013 to 2015 6.7 trucks are the ones that really earned this part its reputation. Those trucks run a dual radiator setup, and the factory upper coolant pipe is a plastic Y that ties it together. That Y is the exact spot it cracks. It is a known failure, it strands trucks constantly, and because of the dual radiator routing it is not the same pipe as the single radiator trucks. If you have a 13 to 15 6.7, this is the one that is coming for you, and our 13-15 6.7 Cummins Fabricated Upper Coolant Pipe for Dual Radiators is the part that ends it. It is TIG welded aluminum, it is not going to get brittle, and it is not going to crack at the Y.
Single Radiator vs Dual Radiator: Get the Right One
This is where people order the wrong part. The 2010 to 2018 6.7 trucks are mostly single radiator, and they take the single radiator pipe. The exception is the 2013 to 2015 trucks built with the dual radiator setup, which take the dual radiator Y-pipe above. Same years, different cooling system, different pipe. If you are on a 10 to 18 truck that is not a 13 to 15 dual radiator, you want the 10-18 6.7 Cummins Fabricated Upper Coolant Pipe for Single Radiator.
The Fabricated Fix, For Every Cummins
We build these out of fabricated aluminum for the whole Cummins lineup, not just the 6.7. Every one of them replaces the failure prone factory piece with something that will outlast the truck. Find your year and setup below.
| Truck | Engine | Cooling setup | FSD Pipe |
|---|---|---|---|
| 1994 to 1998 | 5.9 12V | Single | 94-98 5.9 12V Fabricated Coolant Pipe |
| 1998.5 to 2002 | 5.9 24V | Single | 98.5-02 5.9 24V Fabricated Coolant Pipe |
| 2003 to 2009 | 5.9 / 6.7 | Single | 03-09 5.9/6.7 Fabricated Coolant Pipe |
| 2010 to 2018 | 6.7 | Single Radiator | 10-18 6.7 Single Radiator Pipe |
| 2013 to 2015 | 6.7 | Dual Radiator | 13-15 6.7 Dual Radiator Y-Pipe |
| 2019 to 2022 | 6.7 | Single | 19-22 6.7 Fabricated Coolant Pipe |
Why Fabricated Aluminum
The factory used plastic because it is cheap to mold, not because it is the right material to sit on top of a diesel and soak up heat for fifteen years. Our pipes are mandrel formed and TIG welded out of aluminum, pressure tested, and built to bolt right in where the factory piece came out. No more brittle plastic, no more cracking at the worst possible time. It is a one time fix on a part that the factory designed to eventually fail.
Do It Before It Strands You
If your factory pipe has not cracked yet, it is going to, and it never picks a good time to do it. This is a cheap, bolt-in part that takes a known roadside failure off the table for good. Match it to your year and your cooling setup above and stop worrying about it.
Shop FSD Fabricated Coolant Pipes →