Product Description

FLEECE FPE-CLNTBYPS-CUMMINS-12V-SS CUMMINS COOLANT BYPASS KIT 12V 94-98 WITH STAINLESS STEEL BRAIDED LINE

When you’re driving a 1994-1998 Dodge Ram with the 5.9L 12V Cummins diesel and demand reliability under power, the cooling system’s weakest link is often the rear cylinders. The FLEECE FPE-CLNTBYPS-CUMMINS-12V-SS Coolant Bypass Kit is engineered to eliminate hot-spot issues at the rear of the block by providing industry-leading coolant flow with advanced hardware and a stainless steel braided line for leak-free performance.

This comprehensive kit features a secondary thermostat that activates based on temperature — not just pressure — ensuring consistent cooling across all six cylinders and preventing pressure-related failures such as blown freeze plugs or valve-cover plug issues.

Features

• Designed specifically for 1994-1998 Dodge Ram trucks with 5.9L 12V Cummins engines
• Includes stainless steel braided coolant line and AN/O-ring fittings for a professional, leak-free install
• Secondary thermostat design that triggers on temperature, preventing excessive coolant pressure and eliminating hot-spots
• Improves coolant flow to rear cylinders, reducing coolant temperatures and extending engine life
• Simple installation with OEM-quality components and full hardware kit

Fitment

• Engine: Cummins 5.9L 12V diesel
• Vehicle: Dodge Ram 2500 & 3500 model years 1994-1998 equipped with the 12V 5.9L Cummins
• Application: Cooling system upgrade to address rear-cylinder heat, improved durability under tuning or heavy use

Cross-Reference & Related Fleece Products

To build out the full cooling system and ensure compatibility, consider these matching Fleece Performance parts available at CPP Diesel:

• Fleece Coolant Bypass Kit for 1998.5-2002 5.9L VP Cummins w/ stainless braided line:
  FLEECE FPE-CLNTBYPS-CUMMINS-VP-SS
• Fleece Coolant Bypass Kit for 2003-2007 5.9L Cummins (manual trans) w/ stainless braided line:
  FLEECE FPE-CLNTBYPS-CUMMINS-MAN-SS
• Fleece Coolant Bypass Kit for 2003-2007 5.9L Cummins (auto trans) w/ stainless braided line:
  FLEECE FPE-CLNTBYPS-CUMMINS-0305-SS

Why Buy Your Fleece Coolant Bypass Kit from CPP Diesel?

• Specialty diesel focus: CPP Diesel is dedicated to high-performance Cummins upgrades
• Full support with expert tech and matching components to build a complete system
• Premium Durability: Stainless steel braided coolant line, AN fittings, leak-free design
• Improves cooling performance, enhances durability and reliability for your turbo-diesel build

FAQ

What trucks and engines does the FPE-CLNTBYPS-CUMMINS-12V-SS fit?

This kit fits Dodge Ram 2500 & 3500 trucks with the 5.9L 12V Cummins engine from model years 1994-1998. It is designed for those specific engine blocks.

Will this coolant bypass kit help with rear cylinder overheating?

Yes. The kit addresses poor coolant flow to the rear cylinders on these engines by introducing a secondary thermostat that triggers on temperature, improving flow and balancing temperatures across all cylinders.

Is the stainless steel braided line necessary?

The stainless steel braided line provides higher durability and resistance to abrasion, heat and pressure cycling—especially important in high-performance or tuned diesel applications.

Does this kit require removal of other factory components like the heat exchanger?

For other model years (2003-2007), there are notes about removing the factory transmission fluid heat exchanger; however, for this 1994-1998 kit, you will simply install the supplied bypass thermostat housing and braided line without needing to remove the factory heat exchanger unless your setup is modified.

Is there a Prop 65 warning for this product?

Yes. This product carries a California Proposition 65 warning for cancer and reproductive harm. For more information, visit www.P65Warnings.ca.gov

Specifications for FLEECE FPE-CLNTBYPS-CUMMINS-12V-SS