Coolant Bypass Kit For 2003-2018 Dodge Ram 6.7L/5.9L Cummins Diesel

Coolant Bypass Kit for 2003–2018 Dodge Ram 5.9L / 6.7L Cummins Diesel

Fix rear cylinder overheating & prevent freeze plug failure – the smart upgrade your Cummins engine needs.

Fitment:

Note: This kit is compatible with both stock and tuned vehicles. For tuned applications, we recommend pairing with a delete tuner for best performance and error code prevention.

Why You Need This Coolant Bypass Kit

If you're driving a Dodge Ram Cummins with a 5.9L or 6.7L engine, you're likely aware of a weak point: insufficient coolant flow to the rear cylinders. This design flaw leads to:

• Overheating of cylinders #5 and #6

• Excessive pressure build-up

• Freeze plug blowouts (internal and external)

• Costly engine damage and downtime

Our Coolant Bypass Kit solves this problem by redirecting coolant flow evenly across all six cylinders. It’s a critical upgrade that protects your engine's longevity, especially under load, towing, or tuned performance.

Key Benefits

• ✅ Lowers rear cylinder coolant temps by up to 20°F

• ✅ Even cooling across all cylinders for better reliability

• ✅ Prevents freeze plug blowouts caused by pressure spikes

• ✅ No-leak install with braided hose & AN O-ring fittings

• ✅ Temperature-activated thermostat (not pressure-based like others)

• ✅ Improves long-term engine performance and durability

What’s Included

• Coolant bypass line with braided hose

• Temperature-activated secondary thermostat

• High-quality AN fittings and hardware

• Complete mounting kit for easy installation

Installation Time: 1–3 hours
Warranty: 12-month limited warranty
Instructions: PDF available upon request. Professional install recommended.

How It Works

Unlike cheaper kits that rely on pressure buildup, our system uses a thermostatic control valve that opens when coolant temperatures rise—not when pressure spikes. This prevents problems before they start and reduces stress on the rear of the block.

Please don't Wait Until It’s Too Late

Protect your Cummins engine now to avoid costly repairs and downtime. Whether you're towing, daily driving, or tuned for performance, this Coolant Bypass Kit is a must-have reliability upgrade.

👉 Order now and drive with confidence.

Q1: How do I know if this coolant bypass kit fits my vehicle?

A1: This kit is compatible with: 2003–2007 Dodge Ram 5.9L Cummins (Manual transmission only); 2007.5–2018 Dodge Ram 6.7L Cummins (Manual & Automatic). If you're unsure, please get in touch with our customer support with your VIN or engine details—we’re happy to help you confirm fitment.

Q2: How long does installation take and can I do it myself at home?

A2: Yes, if you’re mechanically inclined and have basic tools. The kit includes all necessary components for a DIY install, which typically takes 1–3 hours. However, professional installation is still recommended for optimal results.

Q3: Can I use this kit with the Mini Maxx tuner?

A3: Yes. This coolant bypass kit is fully compatible with Mini Maxx V1 and V2 tuners, as long as your tuning setup supports the vehicle’s cooling system mods.

Q4: Will installing this kit void my factory warranty?

A4: This is a performance modification that may affect your vehicle's warranty. We recommend checking with your dealer or manufacturer before installing it.

Q5: Is this kit suitable for stock vehicles? Will it trigger any error codes?

A5: Yes, it can be installed on stock or tuned vehicles. The coolant bypass kit is a mechanical solution and does not interfere with sensors or trigger fault codes.

Q6: Is there more than one version of this kit? What's the difference?

A6: Currently, we offer a single upgraded version featuring temperature-based control and high-quality braided hoses. It provides superior coolant flow and pressure relief compared to traditional kits.

Q7: Will this kit leak coolant after installation?

A7: When installed correctly, the kit is 100% leak-free thanks to AN O-ring fittings and braided hoses. Always double-check connections during installation to ensure a proper seal.

Q8: Do I need to drain the coolant before installing this kit?

A8: Yes. You’ll need to partially drain the coolant system before installation to avoid spills and ensure a clean install. We recommend replacing the coolant if it’s old or contaminated.

Q9: Does this kit affect my engine’s emissions system or require a delete tune?

A9: No. This cooling system modification does not interfere with the EGR, DPF, or emissions sensors. However, proper tuning may be required if used alongside other delete components.

Q10: Is ongoing maintenance required after installation?

A10: The bypass kit itself does not require regular maintenance. However, during oil changes or major services, inspect hose connections periodically to ensure everything remains tight and leak-free.