6.7 Cummins Coolant Bypass Hose

Why Does Your 6.7 Cummins Need a Coolant Bypass Hose?

Soot and Coolant Coking Around the EGR Cooler Ports

Hot exhaust gas and soot pack into the EGR cooler passages and cook the coolant into sludge, which then crusts onto the sealing surface where the riser tube meets the cooler. Once that surface pits and corrodes, the O-ring has nothing flat to seal against and you get a slow weep that turns into a gusher.

Thermal Fatigue on the Single Riser Tube O-Ring

That factory joint cycles from cold to full operating temperature thousands of times, and the single square-cut O-ring hardens, flattens, and rolls out of its groove. Heat cycles plus vibration plus the weight of the steel tube hanging off one seal is a recipe for failure, especially on 2013-2018 trucks with the long coolant riser.

The Roll Pin Backs Out and the Tube Walks

The riser tube is located by a small roll pin, and on high-mileage and deleted trucks that pin wallows out and lets the tube walk. Every fraction of movement breaks the O-ring seal and you start losing coolant out the passenger side of the block with no warning.

What Can a Coolant Bypass Hose Solve?

Eliminates the Factory Riser Tube Joint Entirely

The billet aluminum barb adapters press into the factory coolant ports and let you run a dedicated EPDM bypass hose straight across, removing the steel riser tube and its failing O-ring from the loop for good. No joint to rot, no pin to walk, and no more weeping coolant onto the exhaust.

Holds Full System Pressure and Temperature

The 6061-T6 billet barbs and high-temperature EPDM hose carry sustained cooling system pressure and 250-plus degree coolant without softening or collapsing. The Viton O-rings at each port maintain a positive seal through heat cycles that would cook a standard rubber line.

Cleans Up the Bay on Deleted Trucks

On trucks where the EGR cooler has already been blocked off or removed, the bypass hose ties the coolant circuit together cleanly instead of leaving dead ports and stub tubes. It keeps coolant flowing to the rear of the block and the oil cooler where it belongs.

Shop 6.7 Cummins Coolant Bypass Hose by Ram Engine & Fitment Guide

• Freeze Coolant Bypass Kit - Fits 5.9L and 6.7L Cummins in Dodge Ram 2500 3500 (2003-2007 5.9L, 2007.5-2018 6.7L). Addresses the factory coolant crossover and freeze port leakage on first-generation 6.7L and late 5.9L trucks with billet block-off and reroute hardware.
• Coolant Bypass Hose Barb Adapter Kit - Fits 6.7L Cummins in Dodge Ram 2500 3500 (2009-2019). CNC billet aluminum barbs and EPDM hose reroute coolant across the EGR cooler ports on second-generation 6.7L trucks with the notorious riser tube O-ring leak.
• Coolant Bypass Hose Barb Adapter Set - Fits 6.7L Cummins in Dodge Ram 2500 3500 (2009-2019). Complete barb adapter set with Viton O-rings for the 2013-2018 coolant riser and the 2009-2012 riser on deleted and competition trucks.

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What does a 6.7 Cummins coolant bypass hose do?

A 6.7 Cummins coolant bypass hose reroutes engine coolant directly between the cylinder head and the water pump ports, around the EGR cooler circuit. Instead of forcing coolant through the factory steel riser tube and the EGR cooler, the billet aluminum barb adapters and high-temperature EPDM hose carry it straight across.
This keeps full coolant flow to the rear cylinders and the oil cooler while removing the weak riser tube joint that tends to weep and fail. It is a common piece on deleted, competition, and heavy-tow trucks where the EGR cooler is blocked off or removed.

Why does the EGR cooler coolant tube leak on the 6.7 Cummins?

The factory coolant riser tube seals to the EGR cooler with a single square-cut O-ring and a roll pin, and that joint lives in constant heat, soot, and vibration. Heat cycles harden the O-ring, corrosion pits the sealing surface, and the roll pin wallows out and lets the tube walk.
Once the seal breaks you get a slow coolant weep from the passenger side of the block that turns into a steady drip and then a full loss of coolant. The 2013-2018 trucks with the long coolant riser are the worst offenders, but the 2007.5-2012 trucks fail the same way.

Will a coolant bypass hose delete my EGR system?

No, the bypass hose itself only reroutes coolant. It does not block the exhaust side of the EGR valve or remove the EGR cooler on its own.
It is most often installed as part of an EGR delete or block-off package, where the cooler is already capped or pulled and the old coolant riser tube is cut out of the loop. If you want a full delete you still need the EGR block-off plates and a tune, and the bypass hose ties the coolant circuit together afterward.

What years does the 6.7 Cummins coolant bypass kit fit?

Our kits cover the 6.7L Cummins from 2007.5 through 2019, split across the factory architecture changes. The 2007.5-2012 trucks use one riser and cooler layout, the 2013-2018 trucks run the notorious long coolant riser, and the 2009-2019 barb adapter kits bridge the common Ram 2500 and 3500 fitment.
The Freeze kit also reaches back to the 2003-2007 5.9L Cummins for owners doing the same coolant crossover fix. Always confirm your exact year and body before you order, since the 2019 and newer trucks moved to a different platform.

Does this coolant bypass fix a leaking EGR delete coolant hose?

Yes, this is one of the main reasons shops install it. When an EGR delete kit is installed, the supplied square-cut O-ring at the coolant tube joint is usually the first thing to leak, and reusing the factory joint just repeats the failure.
The billet barb adapters and EPDM bypass hose eliminate that riser-to-cooler joint entirely, so there is no cheap O-ring left to blow out. If you are chasing a repeat coolant leak after a delete, the bypass hose is the permanent fix.

Do I have to retune or delete my EGR to run a coolant bypass hose?

You do not need a tune just to install the bypass hardware, since it only changes the coolant routing. The tune question comes up when you also block off or remove the EGR cooler, which sets emissions codes that need to be addressed.
On a stock truck you can run the bypass for the coolant flow benefit, but if the EGR system is being altered you will want a compatible tune and proper block-off plates. Our support team can walk you through what your specific build needs.

What happens if I keep driving with a leaking EGR coolant tube?

A small weep will not strand you today, but it gets worse fast as the sealing surface corrodes and the O-ring continues to flatten. You will slowly lose coolant, risk low-coolant overheating, and on a heavy tow you can spike exhaust gas temperature and crack a head or wipe a set of bearings.
It is cheaper to reroute the coolant with a proper bypass hose than to refill coolant every week and gamble on a head gasket. Catch it early before the joint lets go completely.

Does the coolant bypass kit fit a 2019 and newer 6.7 Cummins?

The barb adapter kits we carry are listed for the 2009-2019 6.7L Cummins, and the 2019 model year is the transition into the new platform. The 2020 and newer Ram 2500 and 3500 use a different EGR cooler and coolant layout, so these specific kits are not a confirmed fit for the newest trucks.
If you have a 2019 or newer truck, contact our support team with your VIN before ordering so we do not send you the wrong hardware. We would rather confirm fitment than have you pull the truck apart twice.

What material should I look for in a 6.7 Cummins coolant bypass hose?

Look for CNC-machined 6061-T6 billet aluminum barb adapters, a reinforced high-temperature EPDM hose rated for full cooling system pressure, and genuine Viton O-rings at the sealing ports. Cheap kits use soft aluminum barbs and standard square-cut rubber rings that soften and weep after a few heat cycles.
The billet barbs press in and hold, the EPDM hose stays flexible under heat, and the Viton seals maintain contact through thousands of temperature swings. That is the difference between a one-time install and a recurring coolant leak.

Is the 6.7 Cummins coolant bypass hose street legal?

Installing a coolant bypass that reroutes or removes EGR system cooling is intended for competition and closed-course off-road use only. On emissions-controlled on-highway vehicles, altering the EGR cooler coolant path can violate federal and state emissions laws, so confirm your exact truck year and whether your 5.9L or 6.7L Cummins is the 2007.5-2018 or 2009-2019 fitment before you order.
Every kit includes free shipping, is backed by our 1-year warranty, and comes with our 45-day return policy so you can verify fitment risk-free.