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Thanksgiving Deal Mishimoto 89-93 Dodge 5.9l Cummins 87.5c High-temperature Thermostat Set [lJ5u8jMv]

$22.99 $73.99 -69%

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 hug

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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 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.

This Part Fits:

Year Make Model Submodel
1989-1993 Dodge D250 Base
1989-1993 Dodge D350 Base
1989-1993 Dodge W250 Base
1989-1993 Dodge W350 Base

What Our Customers Say

January 1, 2026

Absolutely no complaints!

I'm impressed by how incredibly sturdy it feels.

- Bentley F..

January 1, 2026

Absolutely no complaints!

I'm happy with my product and its purchase.

- Meredith G..

January 1, 2026

Absolutely no complaints!

A great product. And it works so perfectly.

- Vicki D..

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