Fleece (FPE-CLNTBYPS-CUMMINS) Cummins Coolant Bypass Kit
Fleece Cummins Coolant Bypass Kit FPE-CLNTBYPS-CUMMINS
Another product from Fleece Performance built out of necessity is the
2003-2016 Cummins Coolant Bypass kit. The Cummins engine cooling system
was designed to adequately cool a 300-350hp engine. When the horsepower
is increased there is an increased demand on the cooling system. The
rear cylinders suffer from a lack of coolant flow, and therefore,
experience the highest coolant temperatures. This can cause excessive
pressure to build in the system, especially the rear of the block and
possibly blow out freeze plugs externally, or the smaller diameter plugs
under the valve cover, leading to a failure. We’ve designed our coolant
bypass kit with 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. Our kit comes with high quality
AN o-ring fittings and AN hose connections with braided hose to ensure a
leak free installation.
The ’03-’07 5.9L automatic transmission version will eliminate the factory transmission fluid heat exchanger. The heat exchanger is not a fluid cooler; it was 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.
All ‘07-‘16 6.7 trucks, both automatic and manual equipped transmissions, do not have a transmission fluid heat exchanger.
For customers with a 6.7L that has a heat exchanger, You will need a heater tube it can be purchased at your local Chrysler Dealership PN:68048997AA. It is very rare that a 6.7L has a heat exchanger, but we have had a few instances where it has been needed.