1999-2013 Cummins High Temperature Thermostat (MMTS-RAM-99H)

Don’t let a weak thermostat slow you down or cook your Cummins. The Mishimoto Dodge 5.9L/6.7L Cummins High-Temperature Thermostat is built to take heat and give your engine the warm-up it deserves. With a higher activation temperature than stock, this bad boy keeps coolant flowing on your terms, getting your 5.9L or 6.7L running fast in even the coldest conditions. Rugged, reliable, and backed by Mishimoto’s Lifetime Warranty, it’s the upgrade your truck’s been begging for.

Part Number: MMTS-RAM-99H

• Direct-fit for 1999–2013 Dodge Ram 5.9L/6.7L Cummins
• Higher activation temperature 205°F vs OEM 190–200°F
• Restricts coolant flow for faster engine warm-up
• Perfect for cold-weather performance
• Built tough with Mishimoto craftsmanship
• Covered by Mishimoto Lifetime Warranty

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• ?

  is there a specific reason this t-stat is not recommended for a 2014 and newer?

  The 1999-2013 Cummins thermostats have a slightly different physical shape and design that fits the earlier model thermostat housing. In 2014, Ram made a change to the cooling system and the thermostat housing, so the older style thermostat will not fit correctly in the newer trucks.