Increased Coolant Flow, Decreased Coolant Temperatures The rear cylinders on the 5.9/6.7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure. Our coolant bypass kit adds a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders. Benefits: Lowers coolant temperature at the rear cylinders Ensures consistent temperatures across all cylinders Prevents damaging coolant pressure build up Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation. Why do I need a Fleece Coolant Bypass? One of the biggest issues on the 5.9/6.7L Cummins is the coolant flow problem to the rear cylinders. This can cause catastrophic failure or blow outs of the freeze plugs in an over-temperature / over-pressure condition. The Fleece Coolant Bypass is one of the most important additions you make to improve the reliability and longevity of the Cummins platform.
Recommended Cross Sell Skus - FPE-351-0304/FPE-CUMM-CP3-10MM-5.9/FPE-351-0407
Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation
Ensures consistent temperatures across all cylinders
Lowers coolant temperature at the rear cylinders
Prevents damaging coolant pressure build up
The Fleece Performance coolant bypass kit is designed specifically for Dodge Ram trucks equipped with 5.9L and 6.7L Cummins engines from 2003 to 2007. This kit addresses a common issue where the rear cylinders on these engines experience inadequate coolant flow, leading to elevated temperatures that can cause severe damage such as blowouts of freeze plugs and coolant pressure failures. By adding a secondary thermostat that operates based on temperature rather than pressure, this bypass kit ensures more uniform coolant distribution across all cylinders, significantly reducing the risk of overheating and related failures.
Constructed with high-quality braided hoses and AN O-ring fittings, the kit guarantees a leak-free installation and long-lasting performance. The primary benefit is the maintenance of consistent engine temperatures, especially at the rear cylinders, which are most vulnerable to heat buildup. This improved thermal regulation enhances engine reliability and longevity by preventing excessive pressure build-up in the cooling system, thus avoiding costly repairs and downtime.
Designed for straightforward installation, the kit is compatible with various Dodge Ram models from 2006 to 2007, including both manual and automatic transmissions. Proper cooling system management is critical for heavy-duty diesel engines, and the Fleece Performance coolant bypass kit delivers an effective solution to mitigate overheating issues. Investing in this component promotes engine health, reduces maintenance costs, and ensures your vehicle maintains optimal performance under demanding conditions.
Features:
Complete kit includes braided hose and AN O-ring fittings for a secure, leak-free installation
Adds a secondary thermostat that operates based on temperature to prevent overheating
Ensures consistent coolant temperature across all cylinders, especially at the rear
Reduces coolant temperature at the rear cylinders to prevent damage
Prevents damaging coolant pressure buildup that can lead to component failure
