Coolant Bypass for 2013-2018 Ram with 6.7L Cummins Fleece Performance

Keep the rear cylinders cool

On the 6.7L Cummins, the cylinders at the back of the block are short on coolant flow and run the hottest. The extra heat can build pressure at the rear of the block and push out freeze plugs, including the small ones under the valve cover.

The Fleece Coolant Bypass adds a second thermostat that works on temperature, not pressure, so all six cylinders stay at an even temperature before pressure ever becomes a problem.

It fits like a factory part and seals with braided hose and AN fittings.

Who it's for

Owners of 2013-2018 Ram 2500/3500 6.7L Cummins trucks who want better cooling reliability.

Key specs (per Fleece)

What's included

• Rear bypass thermostat housing
• Front bypass thermostat housing
• Crossover tube gaskets
• Coolant bypass hose (black braided nylon with high-temp sleeve and an fittings)
• Mounting hardware

Fitment notes

• Fits 2013-2018 Ram 2500/3500 with the 6.7L Cummins (per Fleece).
• Factory transmission fluid heat exchangers are rare on 6.7L trucks. If yours has one, you will also need Mopar heater tube 68048997AA.
• California: Fleece lists CARB EO D-834-7 for this part.

Professional install available at Powertech Diesel, Idaho Falls — call 208-542-7793.