The 12-valve first-gen Cummins in your Ram is considered one of the best diesel engines ever produced, and for good reason. Fuel efficiency, torque, and simplicity are just a few characteristics that give the Cummins its stellar reputation. We're huge fans of the Cummins engine, which is why we've developed a low-temperature thermostat for the 1989-1993 5.9L 12v Cummins. This Mishimoto thermostat activates at a lower temperature (174.2F) compared to the factory thermostat (180F). By lowering the activation temperature, coolant flows through the radiator earlier, maintaining lower fluid temperatures. The Mishimoto low-temperature thermostat is ideal for vehicles in warmer climates, or for use in vehicles experiencing extreme driving/towing conditions. This thermostat includes a high-quality replacement gasket and our signature Mishimoto Lifetime Warranty.
Engine coolant thermostat designed to regulate coolant flow and maintain optimal operating temperature. Ensures efficient warm-up, prevents overheating, and supports reliable performance with a precise fit.
Lower activation temperature allows coolant to flow through the system earlier, maintaining lower coolant temperatures
Ideal for vehicles in warm climates or under extreme driving/towing conditions
Mishimoto 89-93 Dodge 5.9L Cummins 79C High-Temperature Thermostat
Thermostat, Low-Temp, fits Dodge 5.9L First-Gen Cummins 1989-1993
Includes thermostat and high-quality replacement gasket
Engine Coolant Thermostat
Mishimoto MMTS-RAM-89L
Thermostat
