Fleece Coolant Bypass® for 5.9L 12V (FPE-CLNTBYPS-CUMMINS-12V-SS) for 1994-1998 w/ Stainless Steel Braided Line
$376.95
The Fleece Performance Coolant Bypass® (FPE-CLNTBYPS-CUMMINS-12V-SS) is a key upgrade for 1994–1998 Dodge Ram trucks with 5.9L 12-valve Cummins engines. It improves coolant flow and prevents pressure-related failures in the rear cylinders by redirecting coolant to the thermostat housing, ensuring balanced engine temperatures. Built with a durable stainless steel braided line, the kit offers long-lasting, heat- and abrasion-resistant performance. Ideal for performance or heavy-duty use, it enhances engine reliability and cooling efficiency.
Fleece Coolant Bypass® for 5.9L 12V (FPE-CLNTBYPS-CUMMINS-12V-SS) for 1994-1998 w/ Stainless Steel Braided Line
| Weight | 4 lbs |
|---|---|
| Dimensions | 12 × 12 × 9 in |
Fitment
- 1994 Dodge Ram 2500/3500 5.9L 12V Cummins
- 1995 Dodge Ram 2500/3500 5.9L 12V Cummins
- 1996 Dodge Ram 2500/3500 5.9L 12V Cummins
- 1997 Dodge Ram 2500/3500 5.9L 12V Cummins
- 1998 Dodge Ram 2500/3500 5.9L 12V Cummins
Features
Increased Coolant Flow, Decreased Coolant Temperatures
The rear cylinders on the 5.9/6.7L 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. Our 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.
Benefits:
- 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. 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.
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