Fleece Performance Coolant Bypass for 2006-2007 Automatic Transmission
Fleece Performance Coolant Bypass for 2006-2007 Automatic Transmission
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Increased Coolant Flow. Decreased Coolant Temperatures.
The rear cylinders on the 5.9/6.7L Cummins are prone to restricted coolant flow, resulting in the highest coolant temperatures in the engine. Over time, this can lead to excessive pressure buildup in the cooling system—particularly at the rear of the block—causing freeze plugs to blow out externally or smaller-diameter plugs under the valve cover to fail.
The Fleece Performance Coolant Bypass Kit solves this problem at the source. Unlike competing products that only react to excessive pressure, our kit features a secondary thermostat that operates based on temperature, addressing the issue before dangerous pressure levels ever develop. The result is consistent coolant temperatures across all six cylinders.
Key Benefits
- Lowers coolant temperature at the rear cylinders
- Ensures consistent temperatures across all six cylinders
- Prevents damaging coolant pressure buildup
- Complete kit includes braided hose and AN O-ring fittings for a leak-free installation
- Kits for MY 2003+ include billet hose brackets
Why You Need a Fleece Performance Coolant Bypass
Coolant flow restriction to the rear cylinders is one of the most common and serious issues on the 5.9/6.7L Cummins platform. Left unaddressed, it can lead to catastrophic freeze plug blowouts caused by over-temperature and over-pressure conditions. The Fleece Performance Coolant Bypass Kit is one of the most important upgrades you can make to protect the reliability and longevity of your Cummins engine.
