Mishimoto 89-93 Dodge 5.9L Cummins 79C High-Temperature Thermostat

The 12-valve Cummins engine in your first-gen Dodge Ram is a legendary powerplant, known for its durability and torque. To keep that engine running its best, especially in warmer climates or when you're pushing it hard with towing, a reliable cooling system is key. This Mishimoto thermostat is designed to help manage your engine's temperature more effectively than the stock unit.

This thermostat opens at 174.2°F, which is a bit lower than the factory setting of 180°F. By opening sooner, it allows coolant to circulate through the radiator earlier, which helps maintain lower overall fluid temperatures. This can make a noticeable difference when you're dealing with high ambient heat or heavy loads, contributing to a more stable operating temperature for your engine.

When you pick up this thermostat, it comes with a new, high-quality gasket to ensure a good seal. It's a well-built part designed to work with your 5.9L Cummins engine.