FLEECE FPE-CLNTBYPS-CUMMINS-MAN CUMMINS COOLANT BYPASS KIT 2003-2007 MANUAL TRANSMISSION

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 and up 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.

The FLEECE FPE-CLNTBYPS-CUMMINS-MAN Coolant Bypass Kit is a game-changer for your 2003-2007 Cummins manual transmission, addressing a critical flaw in the coolant flow. This innovative kit significantly increases coolant flow to the rear cylinders, ensuring lower temperatures and preventing potentially catastrophic failures.

Unlike standard solutions that react to pressure, this bypass kit features a secondary thermostat that regulates based on actual coolant temperature. This proactive design helps maintain consistency across all six cylinders, alleviating the over-pressure issues that can lead to freeze plug failures. With our complete kit, you'll receive everything you need, including a high-quality braided hose and AN O-ring fittings for a secure, leak-free installation.

• Lowers coolant temperature at the rear cylinders
• Ensures consistent temperatures across all cylinders
• Prevents damaging coolant pressure build-up
• Complete kit with braided hose and AN O-ring fittings for easy installation
• Includes billet hose brackets for 2003 and newer models

Upgrading to the FLEECE Coolant Bypass Kit is crucial for enhancing the reliability and longevity of your Cummins engine. Don’t let coolant flow issues lead to engine failure. This essential upgrade not only eliminates factory transmission fluid heat exchangers—deemed unnecessary in warm climates—but also optimizes your truck’s performance. Invest in your Cummins today and drive with confidence!