# Mishimoto 89-93 Dodge 5.9L Cummins 79C High-Temperature 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.

-   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
-   Includes thermostat and high-quality replacement gasket

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

## Details

- **Price:** 112.35 CAD
- **Vendor:** Mishimoto
- **Type:** Thermostats

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 112.35 CAD | In stock |

## Images

- Photo - Primary
- User 1
- User 1
- User 1
- Photo - in package
- Logo Image

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/mishimoto-89-93-dodge-5-9l-cummins-79c-high-temperature-thermostat)
> Updated: 2026-06-27