Motorad MRD105 Engine Coolant Thermostat

Racing Thermostat for GM Applications

The Motorad MRD105 is a racing thermostat built for high-performance cooling control in demanding street and track use. It is a direct-fit style engine coolant thermostat with an OEM design, a 160°F opening temperature, and an included seal for service replacement on a wide range of Chevrolet, GMC, and Cadillac applications.

Key Features

• 160°F start-to-open temperature for lower operating temperatures in performance cooling setups
• OEM-style design with brass, copper, and stainless steel construction
• Includes a seal with O-ring sealing style
• Jiggle pin weep hole for air bleeding during cooling system service
• Motorad MRD105 part number for easy identification

Detailed Description

Motorad MRD105 is part of the Racing Thermostat line, engineered for high horsepower and high-pressure cooling demands. As an OE-supplier-backed design, it uses a standard OEM-style form factor and a 160°F opening point to help maintain strong cooling efficiency in performance-oriented builds. This thermostat is listed for a broad range of Chevrolet Silverado, GMC Sierra, and Cadillac Escalade applications, along with other GM trucks and performance models. The MRD105 is also a fitment match for Chevrolet Camaro and Corvette applications in the supported years.

This part cross-references Motorad MRD105 for the same application.

What It Helps Address

• Engine temperatures that run higher than desired under load
• Cooling system service needs when replacing a worn thermostat
• Air trapped in the cooling system after maintenance
• Temperature control concerns in performance or racing use
• Fitment needs for GM trucks, SUVs, and performance cars

Installation Notes and Tips

Verify the thermostat housing and seal condition before installation. This unit uses an O-ring seal and requires a gasket or seal during service; the seal is included. Confirm the application by year, make, model, and engine cooling configuration before ordering. The MRD105 is not electric and does not use MAP control.

Quality Assurance

Motorad manufactures this thermostat through an OE-supplier-based process for performance cooling applications. The MRD105 is built to meet the demands of high-pressure, high-horsepower use while maintaining OEM-style fit and function.