This Mishimoto high - temperature thermostat is a must - have for your 1989 - 1993 Dodge Ram with a 5.9L Cummins engine. It's ideal for colder climates or trucks that struggle to reach operating temperatures. With a higher activation temperature of 189.5°F (compared to the factory's 180°F), it restricts coolant circulation longer, allowing the engine to warm up faster. Each unit comes with a thermostat and a high - quality replacement gasket.

Using this thermostat is easy. First, make sure your engine is cool before starting the installation. Remove the old thermostat and its gasket carefully. Then, place the new Mishimoto thermostat in the right position and put on the included high - quality replacement gasket. Make sure everything is tightly sealed. When driving in cold weather, this thermostat will help your engine reach the right temperature quicker. As for maintenance, check the thermostat regularly for any signs of leaks or damage. If you notice any issues, replace it right away to keep your engine running smoothly.