Dodge 5.9L Cummins Coolant Bypass Kit - Fleece Performance (1998.5–2002). This VP Coolant Bypass balances coolant flow to protect rear cylinders and stabilize temps.

Built for 24‑valve VP44 trucks, this kit routes extra coolant from the rear of the block and employs a secondary thermostat that reacts to temperature, not pressure. By addressing the flow shortage at cylinders 5 and 6, it limits hot spots that can spike system pressure and jeopardize freeze plugs. The complete package uses braided hose and AN O‑ring fittings for a tidy, leak‑resistant installation and helps maintain consistent temperatures across all six cylinders.

Features

• Lowers rear‑cylinder coolant temperatures
• Ensures consistent temps across all cylinders
• Secondary thermostat opens by temperature, not pressure
• Braided hose and AN O‑ring fittings for a leak‑resistant install

Questions or ready to plan your build? Call us for fitment advice and scheduling. We offer installation and customization at our Austin, Texas and Los Angeles, California area locations: TX 512-982-9393, CA 562-981-6800.

Purchasing multiple items? Contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov