Fleece Performance 94-98 12V 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.

• 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 94-98 12V Cummins Coolant Bypass Kit is designed to improve the cooling system's efficiency and reliability for 5.9L engines. This kit addresses the common issue of inadequate coolant flow to the rear cylinders, which can lead to excessive temperatures and potential engine failure. By installing this bypass kit, you ensure consistent coolant temperatures across all cylinders, reducing the risk of freeze plug blowouts and catastrophic damage caused by over-temperature conditions. The kit features a secondary thermostat that operates based on temperature rather than pressure, providing precise control and preventing damaging pressure build-up in the cooling system. It includes durable braided hoses and AN O-ring fittings for a leak-free, secure installation that enhances engine longevity and performance. For models from 2003 and later, the kit comes with billet hose brackets, making installation even easier and more robust. Proper coolant management is essential for maintaining optimal engine health, especially in high-performance or heavy-duty applications. This bypass kit is an essential upgrade for Cummins owners seeking to prevent overheating issues and extend the lifespan of their engines. Additionally, for 2003-2007 models with automatic transmissions, this kit replaces the factory transmission fluid heat exchanger, which is designed for cold climate operation, further streamlining your cooling system and reducing potential failure points. Overall, the Fleece Performance coolant bypass kit offers a comprehensive solution to improve cooling consistency, lower rear cylinder temperatures, and prevent pressure-related failures, making it a vital addition to your Cummins engine maintenance routine.

Features:

• Secondary thermostat: Operates based on temperature to prevent pressure buildup

• Complete kit: Includes braided hoses and AN O-ring fittings for leak-free installation

• Temperature regulation: Ensures consistent coolant temperatures across all cylinders

• Rear cylinder cooling: Significantly lowers coolant temperature at the rear cylinders

• Engine protection: Prevents blowouts of freeze plugs caused by overheating or pressure

• Durable construction: Comes with billet hose brackets for MY 2003+ models

• Application compatibility: Designed for 1994-1998 12V Cummins engines and applicable 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