Cummins Coolant Bypass Kit

Features:

• Fits 2007.5-2012 6.7L Cummins
• Improves rear cylinder coolant flow
• Lowers rear cylinder temperatures
• Prevents coolant pressure buildup
• Secondary temperature controlled thermostat
• Helps prevent freeze plug failure
• Ensures even cylinder temperature distribution
• OE fit and finish design
• Braided hose with AN fittings
• Includes thermostat housings and hardware
• Reduces risk of catastrophic overheating
• Enhances long term engine reliability

Protect The Back Of Your Cummins Before Heat Takes Its Toll

If you own a 2007.5-2012 RAM 2500 or 3500 with the 6.7L Cummins, you have probably heard about the cooling imbalance at the rear cylinders. From the factory, those rear cylinders see less coolant flow, which means higher temperatures and added stress over time. The Fleece Coolant Bypass Kit is designed to correct that imbalance and bring consistent cooling across all six cylinders. By lowering temperatures at the back of the block, it helps prevent excessive pressure buildup that can lead to freeze plug failures or more serious engine damage. This is not just a performance upgrade, it is a reliability upgrade that protects your investment. Additionally, the system integrates cleanly with an OE fit and finish, so it looks like it belongs there from day one. For anyone planning to tow, tune, or simply keep their truck for the long haul, this is one of the smartest preventative upgrades you can make.

Temperature Controlled Coolant Management Engineered For Even Flow

At the core of this kit is a secondary thermostat that operates based on temperature rather than pressure. That difference is critical because it addresses the root cause of uneven coolant distribution before pressure spikes become a problem. The kit reroutes coolant flow from the rear of the cylinder head, ensuring that heat is carried away more evenly and efficiently. Furthermore, by stabilizing coolant temperatures across all cylinders, it reduces the risk of localized hot spots that can compromise head gasket integrity and internal components. The complete package includes front and rear thermostat housings, a braided nylon hose with a high temperature protective sleeve, AN O ring fittings, new EGR cross over tube gaskets, and all required mounting hardware. An exhaust back pressure sensor mounting block and line are also included to maintain proper system function. The result is a well engineered cooling solution that enhances durability and gives your 6.7L Cummins the balanced temperature control it should have had from the start.

Fitment: 2007, 2008, 2009, 2010, 2011, 2012 Dodge RAM 2500/3500 6.7L Cummins

Notes:

• Fits 2007.5-2012 RAM 6.7L Cummins only.
• Addresses known rear cylinder cooling imbalance.
• Helps prevent rear freeze plug failure.
• Temperature controlled secondary thermostat design.
• Professional installation recommended.
• Includes new EGR crossover tube gaskets.
• Designed for OE style fit and finish.
• Compatible with stock and modified engines.
• Ideal for tuned or heavy towing trucks.
• Reduces risk of over pressure conditions.
• All major hardware included in kit.
• Improves long term engine durability.