Mishimoto High-Temperature Thermostat

1994–1998 Dodge Ram 2500 / Ram 3500 5.9L Cummins

MMTS-RAM-94H

Overview:

The Mishimoto High-Temperature Thermostat is a direct-fit replacement designed specifically for Dodge Ram 2500 and Ram 3500 trucks equipped with the 5.9L Cummins engine from 1994 to 1998. This thermostat addresses common cooling system issues caused by aging or defective factory units, which can lead to engine overheating and potential internal damage. By upgrading to this high-temperature thermostat, you enhance your engine’s warm-up efficiency and overall cooling system reliability, especially in colder climates.

Engineered to activate at 190°F—10 degrees higher than the factory thermostat—this component delays coolant flow to allow the engine to reach optimal operating temperature faster. This results in improved heater performance and reduced engine wear during cold starts, making it an excellent choice for drivers seeking dependable cooling system upgrades for their classic Dodge Ram trucks.

Key Features:

The Mishimoto High-Temperature Thermostat offers several benefits that improve the cooling system's performance and durability:

• Higher activation temperature of 190°F for quicker engine warm-up
• Direct-fit design ensures easy installation without modifications
• Durable construction engineered to withstand high temperatures and pressure
• Improves heater efficiency in cold weather conditions
• Helps prevent premature engine wear caused by prolonged cold operation
• Compatible with the 5.9L Cummins engine in Dodge Ram 2500 and 3500 models (1994–1998)
• Includes Mishimoto’s Lifetime Warranty for guaranteed quality and reliability

Construction & Design:

Crafted with precision engineering, the Mishimoto thermostat features high-quality materials designed to endure the demanding environment of heavy-duty diesel engines. The thermostat’s robust valve mechanism and corrosion-resistant housing ensure consistent performance and longevity. Its design maintains OEM specifications while offering enhanced thermal control, making it a reliable upgrade over the factory thermostat.

Installation & Fitment:

This thermostat is a direct replacement for the factory unit on 1994–1998 Dodge Ram 2500 and Ram 3500 trucks equipped with the 5.9L Cummins engine. Installation is straightforward and requires no modifications, allowing for a hassle-free upgrade. Simply remove the old thermostat and install the Mishimoto unit to restore optimal cooling system function and improve engine warm-up times.

What's Included:

• Mishimoto High-Temperature Thermostat (190°F activation)
• Gasket or O-ring seal for proper installation
• Installation instructions

Ideal For:

This thermostat is ideal for Dodge Ram 2500 and 3500 owners who want to improve their 5.9L Cummins engine’s cooling system reliability and heater performance, particularly in colder climates. It is perfect for enthusiasts maintaining classic Ram trucks, fleet operators seeking dependable cooling components, and anyone looking to prevent engine overheating and extend engine life through better thermal management.

Mishimoto is a performance cooling brand offering aluminum radiators, intercoolers, oil coolers, hoses, and supporting hardware built to manage heat on hard-driven street and track vehicles. For boosted setups and towing/off-road rigs alike, Mishimoto upgrades are designed to increase cooling capacity and reliability where factory systems can become a limitation.