Fleece FPE-CLNTBYPS-CUMMINS-1318 Coolant Bypass Kit for 2013-2018 Ram 6.7L Cummins

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Part #: FPE-CLNTBYPS-CUMMINS-1318 UPC: 670875718364
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Installation Instructions

Fleece Coolant Bypass Kits FPE-CLNTBYPS-CUMMINS-1318 Details

One of the biggest issues on the 6.7L Cummins is the lack of coolant flow 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 Performance Coolant Bypass is one of the most important additions you can make to improve the reliability and longevity of the Cummins platform. It adds a secondary thermostat to the cooling system, ensuring consistent temperatures across all six cylinders and preventing over-pressure issues.

Key Features

  • Seamless Integration for an OE fit-and-finish
  • 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
  • 1 Year Limited Manufacturer Parts Warranty


Kit Includes:

  • Rear coolant bypass thermostat housing
  • Front coolant bypass thermostat housing
  • New EGR cross-over tube gaskets
  • Braided nylon coolant bypass hose with protective high temperature sleeve and AN fittings
  • Mounting hardware

Note: For model years 2007 - 2018 6.7L trucks, including both automatic and manual equipped transmissions, factory installed transmission fluid heat exchangers are uncommon but can be found in northern climates. For customers with a 6.7L that has a factory installed heat exchanger, an additional heater tube is required and can be purchased at your local Chrysler Dealership [PN:68048997AA] to complete the installation.


This product can expose you to chemicals which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
California Proposition 65 Notice
Verify Fitment

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