Mishimoto Low-Temperature Thermostat

1999–2010 Dodge Ram 2500 / Dodge Ram 3500 5.9L & 6.7L Cummins

MMTS-RAM-99L

Overview:

The Mishimoto Low-Temperature Thermostat is a direct-fit replacement designed specifically for Dodge Ram 2500 and Ram 3500 trucks equipped with 5.9L and 6.7L Cummins engines from 1999 through 2010. A failing thermostat can cause engine overheating and lead to costly internal damage. This thermostat improves cooling system reliability by activating at a lower temperature than the factory unit, allowing coolant to circulate sooner and maintain optimal engine temperatures.

Ideal for drivers who operate their trucks in warmer climates or frequently tow heavy loads, this thermostat helps reduce engine heat buildup under extreme conditions. Backed by Mishimoto’s Lifetime Warranty, it offers durable performance and peace of mind for your Cummins-powered Dodge Ram.

Key Features:

Engineered to enhance cooling efficiency and protect your engine, the Mishimoto Low-Temperature Thermostat offers the following benefits:

• Lower activation temperature of 180°F compared to factory thermostats (190°F or 200°F), promoting earlier coolant flow
• Direct-fit design ensures easy installation without modifications
• Improves engine temperature regulation under heavy towing and extreme driving conditions
• Compatible with Dodge Ram 2500 and 3500 models from 1999 to 2010 with 5.9L and 6.7L Cummins engines
• Constructed with high-quality materials for long-lasting durability
• Helps prevent overheating and potential engine damage
• Includes Mishimoto Lifetime Warranty for superior quality assurance

Construction & Design:

The Mishimoto Low-Temperature Thermostat is crafted from premium materials designed to withstand the rigors of heavy-duty use and high-temperature environments. Its precision-engineered valve opens at a consistent 180°F, ensuring reliable coolant flow activation. The robust construction resists corrosion and wear, providing dependable performance over the life of your vehicle. This thermostat is built to meet or exceed OEM specifications, guaranteeing a perfect fit and function within your Dodge Ram’s cooling system.

Installation & Fitment:

Installation is straightforward thanks to the thermostat’s direct-fit design, which matches the factory unit’s dimensions and mounting points. No modifications or special tools are required, making it an ideal upgrade for DIY enthusiasts and professional mechanics alike. This thermostat fits Dodge Ram 2500 and 3500 models from 1999 through 2010 equipped with 5.9L or 6.7L Cummins engines, ensuring compatibility across a wide range of trucks.

What's Included:

• Mishimoto Low-Temperature Thermostat (180°F activation)
• Gasket or O-ring as required for installation
• Installation instructions

Ideal For:

This thermostat is perfect for Dodge Ram owners who demand improved cooling system performance, especially those who:

• Operate their trucks in hot or warm climates
• Regularly tow heavy trailers or haul large loads
• Seek to prevent overheating and extend engine life
• Require a reliable, long-lasting replacement for a failing or aging factory thermostat

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.