Fleece Performance · New
Fleece Performance 13-18 RAM 2500/3500 6.7L Cummins Coolant Bypass Kit
MPN FPE-CLNTBYPS-CUMMINS-1318 · Store SKU fpeFPE-CLNTBYPS-CUMMINS-1318
Supplier stock checked 11/8/2026, 5:33:40 AM UTC. Adding a part does not reserve it.
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Product details
The Fleece Performance coolant bypass for the 2013-2018 RAM with 6.7L Cummins seamlessly integrates with your truck for an OE fit-and-finish. Features Increased Coolant Flow, Decreased Coolant Temperatures 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. 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. Why do I need aFleece Coolant Bypass? One of the biggest issues on the 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. Kit Includes: Rear coolant bypass thermostat housing Front coolant bypass thermostat housing New EGR cross-over tube gaskets Black braided nylon coolant bypass hose with protective high temperature sleeve and AN fittings Mounting hardware Coolant Bypass Kit for 2013-2018 RAM with 6.7L Cummins
Manufacturer fitment & guides
Check FPE-CLNTBYPS-CUMMINS-1318 against the manufacturer’s application information below.
Part-specific notes
- California Proposition 65: Y
