FLEECE FPE-CLNTBYPS-CUMMINS-0305 CUMMINS COOLANT BYPASS KIT 2003-2005 AUTO TRANS

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.
• Kits for MY 2003+ include billet hose brackets.

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. The '03-'07 5.9L automatic transmission version will eliminate the factory transmission fluid heat exchanger.

The heat exchanger is not a fluid cooler; it was designed for use in cold climates to warm the transmission fluid with the engine coolant. It is not necessary for use in warm climates or high horsepower applications, nor does it detrimentally affect the trucks performance when removed. All ‘07-‘13 6.7 trucks, both automatic and manual equipped transmissions, do not have a transmission fluid heat exchanger.

Optimize your Cummins performance with the FLEECE FPE-CLNTBYPS-CUMMINS-0305 Coolant Bypass Kit, designed specifically for 2003-2005 models. This revolutionary kit significantly enhances coolant flow and lowers temperatures where it matters most – at the rear cylinders of your 5.9/6.7L Cummins. Say goodbye to overheating and potential failures that could lead to costly repairs.

The innovative bypass kit incorporates a secondary thermostat that operates based on temperature rather than excessive pressure, enabling it to proactively manage coolant flow. This ensures that all six cylinders in your engine receive consistent coolant temperatures, preventing harmful pressure build-up and subsequent damage such as blown freeze plugs.

• Greatly lowers coolant temperature at rear cylinders to enhance engine performance
• Ensures uniform temperatures across all cylinders for reliability
• Prevents damaging coolant pressure build-up that can lead to engine failure
• Includes a complete installation kit with braided hose and AN O-ring fittings for a leak-free experience
• Upgraded kits for model year 2003+ come with robust billet hose brackets for secure placement

Investing in the Fleece Coolant Bypass is essential for any Cummins owner aiming to boost engine reliability and longevity. Particularly for the '03-'07 5.9L automatic transmission versions, this kit will eliminate the unnecessary factory transmission fluid heat exchanger, enhancing overall efficiency without compromising performance. Equip your truck with the right kit to protect your investment and ensure seamless, high-performance driving.