Product Overview
Fleece Performance Coolant Bypass Kit for 2006–2007 Dodge/Ram 5.9L Cummins Automatic Transmission
The Fleece Performance Coolant Bypass Kit is designed for compatible 2006–2007 Dodge/Ram 2500 and Ram 3500 trucks equipped with the 5.9L 24-valve Cummins and automatic transmission.
The rear cylinders of the 5.9L Cummins can receive less coolant flow than the front cylinders, which may contribute to higher localized coolant temperatures and pressure near the rear of the engine block.
This kit adds a secondary, temperature-controlled coolant path intended to improve coolant circulation at the rear cylinders while maintaining a clean installation layout.
Key Benefits
- Improved Rear-Cylinder Coolant Flow: Adds an additional coolant path at the rear of the engine.
- More Consistent Cylinder Temperatures: Designed to help reduce temperature differences between the front and rear cylinders.
- Temperature-Controlled Operation: Uses a secondary thermostat that opens according to coolant temperature.
- Pressure Management: Improved coolant circulation can help reduce excessive localized cooling-system pressure.
- Complete Installation Kit: Includes braided coolant hose and AN O-ring fittings.
- Billet Hose Brackets: Kits for model year 2003 and newer applications include billet hose brackets.
How the Coolant Bypass Works
The factory cooling-system layout can leave the rear cylinders with less coolant circulation than the front cylinders. Under demanding operating conditions, this may contribute to increased coolant temperature and localized pressure near the rear of the engine block.
The Fleece Performance Coolant Bypass adds a secondary thermostat and coolant passage at the rear of the engine. As coolant temperature rises, the bypass thermostat opens and allows additional coolant to circulate toward the front of the cooling system.
This temperature-based operation is designed to improve coolant distribution before excessive localized pressure becomes a larger concern.
Cooling-System Protection
By improving coolant circulation at the rear cylinders, the bypass kit is designed to help reduce the conditions that can contribute to excessive cooling-system pressure and freeze-plug concerns.
Actual cooling-system performance can vary based on engine load, vehicle use, cooling-system condition, tuning, installation quality, climate, and other modifications.
Application Notes
This version is intended for 2006–2007 5.9L Cummins trucks equipped with an automatic transmission.
The 2003–2007 5.9L automatic-transmission version removes the factory transmission-fluid heat exchanger. The heat exchanger is designed to warm transmission fluid using engine coolant in cold climates. Removal may be acceptable for warm-climate or high-horsepower applications, but transmission-fluid temperature management should be considered based on the truck’s use and operating environment.
- Transmission: Automatic transmission applications only
- Heat Exchanger: Factory transmission-fluid heat exchanger is removed during installation
- Climate Note: Consider cold-weather operation before removing the factory heat exchanger
- Model Years: 2006–2007
- Engine: 5.9L 24-Valve Cummins
Coolant-Flow Comparison
Without Coolant Bypass
With Fleece Performance Coolant Bypass
Product Specifications
- Product Type: Coolant bypass kit
- Application: 2006–2007 Dodge/Ram 2500 and Ram 3500
- Engine: 5.9L 24-Valve Cummins
- Transmission: Automatic transmission only
- Bypass Operation: Temperature-controlled secondary thermostat
- Hose Type: Braided coolant hose
- Fitting Type: AN O-ring fittings
- UPC: 670875715066
- Shipping Weight: 10 lbs
Certification
CARB Executive Order: D-834-9
Warranty
Installation Resources
Trademark Information
Protected under U.S. Trademark Registration Nos. 6,099,979; 6,099,980; 6,099,981; and 7,659,022.
California Proposition 65 Warning
WARNING: Cancer and Reproductive Harm — P65Warnings.ca.gov
Disclaimer
Verify fitment before ordering. Emissions, warranty, and installation requirements may vary by vehicle and location. This kit is intended for compatible 2006–2007 5.9L Cummins trucks with automatic transmission and removes the factory transmission-fluid heat exchanger during installation.
Vehicle Fitment
| Year | Make | Model | Engine | Transmission |
|---|---|---|---|---|
| 2006–2007 | Dodge/Ram | Ram 2500 | 5.9L 24-Valve Cummins | Automatic |
| 2006–2007 | Dodge/Ram | Ram 3500 | 5.9L 24-Valve Cummins | Automatic |
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