Fleece Performance Coolant Bypass Kit for 2013-2018 Ram 2500/3500 (6.7L) FPE-CLNTBYPS-CUMMINS-1318

Fits 2013-2018 Ram 2500 and 3500 (6.7L).

The 6.7L Cummins engine often suffers from restricted coolant flow to the rear cylinders, leading to localized overheating and excessive pressure buildup. This thermal stress can cause external freeze plugs to fail or blow out the smaller diameter plugs located under the valve cover. The Fleece Performance Coolant Bypass Kit addresses this design flaw by adding a secondary thermostat at the rear of the block.

Unlike pressure-relief style kits that only react once a problem exists, this temperature-based bypass ensures consistent coolant flow across all six cylinders. By opening based on temperature, it proactively regulates heat at the rear of the engine, protecting your cooling system and improving long-term reliability. The kit features an OE-style fit and finish with high-quality components designed for a leak-free installation.

• Thermostat Regulation: Uses a temperature-sensitive secondary thermostat for proactive cooling management.
• Leak-Free Seal: Includes AN O-ring fittings and a black braided nylon coolant hose.
• Thermal Protection: Prevents damaging pressure buildup and freeze plug blowouts.
• Complete Kit: Includes front and rear thermostat housings, EGR crossover tube gaskets, high-temperature protective hose sleeve, and all necessary mounting hardware.
• Manufacturer Part Number: FPE-CLNTBYPS-CUMMINS-1318