Fleece FPE-CLNTBYPS-CUMMINS-0305-SS Coolant Bypass Kit

Description

Fleece Performance Coolant Bypass 2003-2005 Automatic Transmission w/ Stainless Steel Braided Line

The rear cylinders on the 5.9/6.7L Cummins suffer from a lack of coolant flow, leading to the highest coolant temperatures, but the Fleece FPE-CLNTBYPS-CUMMINS-0305-SS Coolant Bypass Kit offers an effective solution. This temperature imbalance can cause excessive pressure in the cooling system, particularly at the rear of the block, potentially blowing out freeze plugs externally or smaller diameter plugs under the valve cover, leading to failure. Our coolant bypass kit includes a secondary thermostat that, unlike other brands, operates based on temperature rather than excessive pressure. This ensures consistent temperatures across all six cylinders, solving the problem before pressure becomes a concern.

Fleece FPE-CLNTBYPS-CUMMINS-0305-SS Coolant Bypass Kit Features:

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. Kits for MY 2003+ include billet hose brackets.

Why do I need a Fleece Performance Coolant Bypass?

One of the biggest issues on the 5.9/6.7L 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.