Thermostat

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.

Additional Information

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.

Part Type

Engine Coolant Thermostat

Product Overview

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 (174.2°F) compared to the factory thermostat (180°F). 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.

• Ideal for vehicles in warm climates or under extreme driving/towing conditions
• Includes thermostat and high-quality replacement gasket
• Lower activation temperature allows coolant to flow through the system earlier, maintaining lower coolant temperatures

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Product Details

Reference Information

Thermostat, 1989-1993 Dodge 5.9L Cummins Low-Temp Thermostat, 79C

A defective thermostat can result in engine overheating and potential internal damage. Improve the reliability of your Toyota cooling system with a Mishimoto Low-Temperature Racing Thermostat and housing! They're designed as a direct-fit replacement for your aging stock unit. The Mishimoto thermostats have a lower activation temperature (71 degrees C/160 degrees F) compared to the factory thermostat (82 degrees C/180 degrees F). The lower activation temperature allows coolant to flow through the engine earlier, which yields and maintains lower engine temperatures. These thermostats are ideal for use in warmer climates, on vehicles making more power than stock, or under extreme towing/driving conditions. The stock-style housing with O-ring will provide a proper seal and installs easily. Order the model recommended for your application.