6.7 Cummins Coolant Bypass Kit

Why Does Your 6.7 Cummins Need a Coolant Bypass?

Brittle Plastic Coolant Fittings That Crack and Leak

The factory coolant elbows and quick-connect fittings at the thermostat housing and throttle valve are molded plastic. Years of heat cycling and vibration make them snap, leaving you with a slow seep or a sudden coolant dump on the ground. The 2009-2019 trucks are notorious for the coolant hose barb pulling loose or breaking flush, which is exactly why we sell the aluminum barb adapter and leak repair kits.

EGR Cooler Rupture Sending Debris Through the System

When the EGR cooler fatigues internally, it releases casting sand and silicate gel straight into the coolant stream. That debris migrates into the heater core, packs the tiny tubes, and kills your cab heat long before the cooler itself fails outright. A coolant bypass reroutes flow around that circuit so the heater core keeps getting clean coolant.

Coolant Pressure Buildup and Rear Cylinder Heat

The stock coolant path was engineered to feed the EGR cooler. Restrict or delete that path without managing the circuit and you raise pressure and starve flow at the back of the block. Our bypass gives the coolant a controlled route back to the thermostat, balancing flow and pressure instead of forcing it through passages that no longer serve a purpose.

What Can a Coolant Bypass Solve?

Replaces Plastic Barbs With CNC 6061-T6 Aluminum

The adapter and repair kits press in where the broken plastic fitting sat, giving you a machined aluminum barb that the EPDM hose clamps onto with a 304 stainless constant-torque clamp. No more snapped-off nipples, no more weeping quick-connects.

Bypasses the EGR Cooler and Throttle Valve Coolant Circuit

For deleted trucks the full bypass kit takes the EGR cooler and throttle valve coolant lines out of the loop and routes coolant directly. On 2013-2019 Rams the combo EGR delete and coolant bypass does it in one job, eliminating the leak source and the dead-end circuit at the same time.

Restores Consistent Cab Heat and Coolant Flow

By keeping debris-loaded coolant out of the heater core and maintaining steady volume, the bypass brings back even defrost and floor heat and stabilizes engine temperature under tow.

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

• Coolant Bypass Hose Barb Adapter Kit - Fits 6.7L Cummins in Dodge Ram 2500/3500 (2009-2019). CNC 6061-T6 aluminum barb replaces the broken plastic fitting at the coolant hose connection.
• Coolant Hose Barb Adapter Leaking Repair Kit - Fits 6.7L Cummins in Dodge Ram (2009-2019). Aluminum barb plus seal hardware to stop the seeping quick-connect and restore a dry coolant circuit.
• Coolant Bypass Kit - Fits 5.9L and 6.7L Cummins in Dodge Ram 2500/3500 (2003-2018). Full bypass that reroutes coolant around the EGR cooler and rear head circuit across both the 5.9 and the early through mid 6.7 generations.
• EGR Delete Throttle Valve Coolant Bypass - Fits 6.7L Cummins in Dodge Ram 2500/3500 (2013-2019). Deletes the throttle valve and EGR cooler coolant feed in one kit for the high-output 6.7 generation that uses the coolant-run throttle body.

Why Choose EGR Performance?

The industry standard for high-performance diesel reliability.

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We aren't just selling parts. We live in this industry. With two decades of hands-on experience providing specialized modification solutions for heavy-duty truck owners, our upgrades have been extensively proven across every driving environment, from daily towing to high-performance tracks.

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Thousands of diesel owners trust us to unlock their engine's true potential. Our massive library of positive customer feedback and successful build case studies proves one thing: our kits deliver real horsepower, lower EGTs, and flawless reliability in the real world.

What does a 6.7 Cummins coolant bypass kit do?

A 6.7 Cummins coolant bypass kit reroutes engine coolant around the EGR cooler and the coolant-fed throttle valve instead of pushing it through those failure-prone passages.
It replaces the factory plastic coolant fittings with CNC-machined 6061-T6 aluminum barbs sealed by high-temperature EPDM hose.
On deleted or hard-worked Rams the bypass balances coolant flow and pressure, keeps clean coolant reaching the heater core, and stops the leaks that dump coolant in your driveway.

Why does my 6.7 Cummins lose cab heat, and how does a coolant bypass help?

When the EGR cooler fatigues it releases casting sand and silicate gel into the coolant, and that debris packs into the tiny tubes of the heater core.
Once the core clogs you lose defrost and floor heat even though the engine runs fine.
A coolant bypass takes the EGR cooler circuit out of the loop so clean coolant keeps flowing to the heater core, which protects and can help restore your cab heat.

Is a 6.7 Cummins coolant bypass the same as a heater core bypass?

No. A true coolant bypass reroutes coolant around the EGR cooler and throttle valve circuit while keeping flow to the heater core, so you keep your heat.
A heater core bypass instead cuts flow to the heater core entirely, usually to limp past a leaking core, and you lose all cab heat.
Our 6.7 Cummins coolant bypass kit is engineered to preserve heater-core flow, not block it off.

Will a coolant bypass repair kit stop the leaking coolant fittings on my 6.7 Cummins?

Yes. The plastic coolant barbs and quick-connects at the thermostat housing and throttle valve get brittle from heat cycling and crack or snap off, which is the source of most slow seeps on 2009-2019 Rams.
Our aluminum barb adapter and leaking repair kits press into that same location and seal with EPDM hose and 304 stainless clamps.
You get a service-grade fitting that holds coolant pressure through thousands of heat cycles instead of cracking at 150,000 miles.

Do I still need a coolant bypass after deleting the EGR cooler on a 6.7 Cummins?

The factory coolant path was designed to feed the EGR cooler, so once that cooler is deleted the circuit is left open and the coolant needs a controlled route.
On 2013-2019 Rams the combo EGR delete and coolant bypass closes that loop in one job, removing both the leak source and the dead-end circuit.
It also protects the heater core from the debris a dying cooler pushes through before you catch it.

Which 6.7 Cummins coolant bypass kit fits my Dodge Ram?

Fitment splits by generation. The full Coolant Bypass Kit covers the 5.9L and early 6.7L Cummins in Dodge Ram 2500/3500 from 2003 through 2018.
For the 2009-2019 6.7L the barb adapter and leaking repair kits target the broken coolant fittings, while the EGR delete and coolant bypass combo fits the 2013-2019 high-output generation with the coolant-run throttle valve.
Match the kit to your exact year and engine, because the coolant routing changed across the 2007.5-2009, 2010-2012, and 2013-2018 revisions.

How does your 6.7 Cummins coolant bypass compare to the Fleece coolant bypass?

The Fleece Performance coolant bypass targets rear cylinder coolant temperature on the 2007.5-2018 6.7L by routing coolant back to the thermostat housing.
Our kits focus on the EGR cooler and throttle valve coolant circuit, the leaky plastic fittings, and the heater-core clog issue, which is what most shop owners are actually chasing on these trucks.
You get the same CNC aluminum and EPDM hardware at a fraction of the Fleece price, with the same goal of a clean, leak-free coolant circuit.

How do I install a 6.7 Cummins coolant bypass kit?

Drain the coolant down, relieve system pressure, and cut or remove the factory coolant hose at the thermostat or throttle valve connection.
Press in the aluminum barb adapter, route the EPDM bypass hose, and cinch the 304 stainless clamps to spec, then refill and bleed the system.
Most kits go in with hand tools in an afternoon, and our 24/7 live support can walk you through fitment and post-install checks.

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

Insist on CNC-machined 6061-T6 billet aluminum barbs, high-temperature EPDM or silicone coolant hose, and 304 stainless steel clamps and hardware.
Avoid kits that reuse brittle plastic fittings or mild-steel clamps that rust in the coolant path.
Every kit in this collection ships with free shipping, is backed by our one-year warranty, and carries a 45-day return policy so you can confirm fitment and finish risk-free.

Is a 6.7 Cummins EGR coolant bypass street legal or off-road only?

The EGR delete and coolant bypass combo is sold for competition and closed-course off-road use only, because removing or bypassing emissions components can violate federal and state emissions laws on registered trucks.
The straight coolant bypass, barb adapters, and repair kits are direct-fit cooling replacements, but on a deleted truck you are still responsible for your local emissions rules, so check fitment and your jurisdiction before ordering.
All kits ship free, carry our one-year warranty, and are covered by the 45-day return policy.