2019-2022 Cummins Fleece Coolant Bypass Kit (FPE-CLNTBYPS-CUMMINS-19)

Fits

The rear cylinders on the 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. Fleece Performance coolant bypass kit adds a secondary thermostat, that, unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before the pressure becomes an issue by ensuring consistent temperatures across all six cylinders.

One of the biggest issues with the 6.7L Cummins is the coolant flow problem to the rear cylinders. This can cause catastrophic failure or blowouts 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. 

Part Number:  FPE-CLNTBYPS-CUMMINS-19

• 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.
• Rear coolant bypass thermostat housing
• Front coolant bypass thermostat housing
• New EGR cross-over tube gaskets
• Black braided nylon coolant bypass hose with AN fittings
• Mounting hardware

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• 1-year limited warranty