Mishimoto 89-93 Dodge 5.9L Cummins 87.5C High-Temperature Thermostat MMTS-RAM-89H
Engine Coolant 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 weve developed a high-temperature thermostat for the 1989-1993 5.9L 12v Cummins. This Mishimoto thermostat activates at a higher temperature (189.5°F) compared to the factory thermostat (180°F). By raising the activation temperature, coolant flows through the system later, promoting quicker engine warmup. The Mishimoto high-temperature thermostat is ideal for vehicles in cold climates, where rapid warmup and quicker in-cabin heat is vital. This thermostat includes a high-quality replacement gasket and our signature Mishimoto Lifetime Warranty.
Vehicle Fitments:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1989 - 1993 | Dodge | D250 | Adventurer, Custom, Base, Club Cab |
| 1990 - 1993 | Dodge | D250 | Prospector |
| 1989 - 1993 | Dodge | D350 | RD, Base |
| 1989 - 1993 | Dodge | W250 | Base |
| 1989 - 1993 | Dodge | W350 | Base |