Description

Fleece Performance Coolant Bypass for 2003-2007 Manual Transmission w/ Stainless Steel Braided Line

The rear cylinders on the 5.9L 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. The Fleece FPE-CLNTBYPS-CUMMINS-MAN-SS 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.

Fleece FPE-CLNTBYPS-CUMMINS-MAN-SS Coolant Bypass Kit Benefits:

1. Lowers coolant temperature at the rear cylinders
2. Ensures consistent temperatures across all cylinders
3. Prevents damaging coolant pressure build up
4. Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation.

Why do I need a Fleece Performance Coolant Bypass?

One of the biggest issues on the 5.9L 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 Performance Coolant Bypass is one of the most important additions you make to improve the reliability and longevity of the Cummins platform.

APPLICATION NOTES

The 2003 – 2007 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.

VIDEOS

PROP 65 WARNING