Fleece Performance 2006-2007 Auto Trans Cummins Coolant Bypass Kit with Stainless Steel Braided Line

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. Application Notes: The 2003 - 2007 5.9L automatic transmission version will eliminate the factory transmission fluid heat exchanger. The heat exchanger is designed for use in cold climates to warm the transmission fluid with the engine coolant. Cummins Coolant Bypass Kit (2006-2007 Auto Trans) w/ Stainless Steel Braided Line

• 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 an essential upgrade for 2006-2007 Cummins engines equipped with automatic transmissions. Designed specifically for the 5.9L and 6.7L engines, this kit addresses a common issue where coolant flow to the rear cylinders is insufficient, leading to elevated temperatures that can cause serious engine damage. By adding a secondary thermostat that operates based on temperature rather than pressure, this kit helps maintain consistent coolant temperatures across all cylinders, significantly reducing the risk of freeze plug blowouts and cooling system failures. Maintaining proper coolant flow is crucial for engine longevity, especially in high-demand applications where overheating can cause catastrophic failure. The complete kit includes high-quality braided hoses and AN O-ring fittings, ensuring a leak-free installation, with billet hose brackets included for models from 2003 onward. Proper coolant management not only improves engine reliability but also enhances overall performance, making this an invaluable addition for Cummins owners seeking durability and peace of mind. Note that for the 2003-2007 automatic transmission models, the kit replaces the factory transmission fluid heat exchanger, which is primarily used in cold climates to warm the transmission fluid, further simplifying and improving the cooling system. Investing in the Fleece Performance coolant bypass kit is an effective way to prevent overheating issues, extend engine life, and ensure consistent operation under demanding conditions.

Features:

• Complete kit includes braided hose and AN O-ring fittings for a leak-free installation

• Ensures consistent coolant temperatures across all cylinders

• Lowers coolant temperature at the rear cylinders to prevent overheating

• Prevents damaging coolant pressure buildup in the cooling system

• Includes billet hose brackets for secure mounting on MY 2003+ models

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: Compliant
Carb Acknowledgement Required: false
Carb Eo Number: D-834-9
Regular Stock: t
Units Per Sku: 1