Fleece Performance FPE-CLNTBYPS-CUMMINS-1318 Coolant Bypass Kit for 2013-2018 RAM 6.7L Cummins

The Fleece Performance Coolant Bypass Kit is an essential upgrade for 2013-2018 RAM trucks equipped with the 6.7L Cummins engine. This comprehensive kit addresses a critical design flaw in the factory cooling system by improving coolant flow to the rear cylinders, preventing overheating and catastrophic freeze plug failures.

Why You Need This Kit:

The rear cylinders on the 6.7L Cummins suffer from inadequate coolant flow, causing them to run significantly hotter than the front cylinders. This temperature imbalance creates excessive pressure buildup in the cooling system, particularly at the rear of the block. Over time, this pressure can blow out freeze plugs externally or damage the smaller diameter plugs under the valve cover, leading to costly engine failures.

How It Works:

Unlike competing products that rely on pressure-activated valves, the Fleece Coolant Bypass features a secondary thermostat that responds to temperature changes. This proactive approach solves the cooling problem before dangerous pressure levels develop, ensuring consistent temperatures across all six cylinders and maintaining optimal cooling system performance.

Key Benefits:

• Significantly lowers coolant temperatures at the rear cylinders
• Maintains consistent temperatures across all six cylinders
• Prevents damaging coolant pressure buildup that leads to freeze plug failure
• Temperature-activated secondary thermostat (not pressure-activated)
• OEM-quality fit and finish integrates seamlessly with your truck
• Complete kit with braided hose and AN O-ring fittings ensures leak-free installation

Complete Kit Includes:

• Rear coolant bypass thermostat housing
• Front coolant bypass thermostat housing
• New EGR crossover tube gaskets
• Black braided nylon coolant bypass hose with high-temperature protective sleeve
• AN O-ring fittings for secure, leak-free connections
• All necessary mounting hardware

This coolant bypass kit is one of the most important reliability upgrades you can make to your 6.7L Cummins, protecting your investment and extending the life of your engine.