
Elevate your engine's performance and longevity with the Fleece Coolant Bypass Kit 12V. Designed for the 5.9 Cummins, this kit ensures optimal cooling under high-performance conditions, preventing overheating and potential engine damage. With its straightforward bolt-on installation, you can enhance your engine's cooling system without the need for head removal or complex modifications.
Features:
- Effective Cooling: Maintains optimal engine temperature under high loads with a 180-degree secondary thermostat.
- Easy Installation: Bolt-on design allows for a quick and hassle-free setup—no drilling, cutting, or welding required.
- Customizable Appearance: Choose between braided black nylon or braided stainless steel hoses to match your engine bay's style.
- Universal Compatibility: Fits all Cummins engines, ensuring widespread utility.
- Durable Construction: Engineered to prevent engine failure caused by high coolant temperatures, backed by a 1-year limited warranty for your peace of mind.
Upgrade to the Fleece Coolant Bypass Kit 12V today and keep your 5.9 Cummins running cool and efficient, no matter the demands you place on it.

Elevate your engine's performance and longevity with the Fleece Coolant Bypass Kit 12V. Designed for the 5.9 Cummins, this kit ensures optimal cooling under high-performance conditions, preventing overheating and potential engine damage. With its straightforward bolt-on installation, you can enhance your engine's cooling system without the need for head removal or complex modifications.
Features:
Effective Cooling: Maintains optimal engine temperature under high loads with a 180-degree secondary thermostat.
Easy Installation: Bolt-on design allows for a quick and hassle-free setup—no drilling, cutting, or welding required.
Customizable Appearance: Choose between braided black nylon or braided stainless steel hoses to match your engine bay's style.
Universal Compatibility: Fits all Cummins engines, ensuring widespread utility.
Durable Construction: Engineered to prevent engine failure caused by high coolant temperatures, backed by a 1-year limited warranty for your peace of mind.
Upgrade to the Fleece Coolant Bypass Kit 12V today and keep your 5.9 Cummins running cool and efficient, no matter the demands you place on it.[...]
Elevate your engine's performance and longevity with the Fleece Coolant Bypass Kit 12V. Designed for the 5.9 Cummins, this kit ensures optimal cooling under high-performance conditions, preventing overheating and potential engine damage. With its straightforward bolt-on installation, you can enhance your engine's cooling system without the need for head removal or complex modifications.
Features:
- Effective Cooling: Maintains optimal engine temperature under high loads with a 180-degree secondary thermostat.
- Easy Installation: Bolt-on design allows for a quick and hassle-free setup—no drilling, cutting, or welding required.
- Customizable Appearance: Choose between braided black nylon or braided stainless steel hoses to match your engine bay's style.
- Universal Compatibility: Fits all Cummins engines, ensuring widespread utility.
- Durable Construction: Engineered to prevent engine failure caused by high coolant temperatures, backed by a 1-year limited warranty for your peace of mind.
Upgrade to the Fleece Coolant Bypass Kit 12V today and keep your 5.9 Cummins running cool and efficient, no matter the demands you place on it.