Fleece Coolant Bypass Kits

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The rear cylinders on Dodge Ram Cummins diesels suffer from a lack of coolant flow and because of this experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling system, especially the rear of the block. This can blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure. Fleece Coolant Bypass Kits add a secondary thermostat that 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.

Key Features

  • 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


The 2003 – 2007 Dodge Ram 5.9L automatic transmission version will eliminate the factory transmission fluid heat exchanger. The heat exchanger is designed for use in cold climates to warm the transmission fluid with the engine coolant. It is not necessary for use in warm climates or high horsepower applications, nor does it detrimentally affect the trucks performance when removed. 

For Dodge Ram trucks for the years 2007 - 2018 with the 6.7L Cummins, including both automatic and manual equipped transmissions, factory installed transmission fluid heat exchangers are uncommon. For customers with a 6.7L that has a heat exchanger, a heater tube can be purchased at your local Chrysler Dealership [PN:68048997AA] to complete the installation.

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