Mishimoto Low-Temperature Racing Thermostat & Housing for 2003-2024 Toyota 4Runner/FJ/Tacoma/Tundra (4.0L) MMTS-4RUN40-03

Fits select 2003-2024 Toyota 4Runner, FJ Cruiser, Tacoma, and Tundra models equipped with the 4.0L engine.

Protect your engine from overheating and maintain optimal operating temperatures with the Mishimoto Low-Temperature Racing Thermostat and Housing. Designed as a direct-fit replacement for the aged factory unit, this thermostat activates at 71°C (160°F), significantly earlier than the standard 82°C (180°F) OEM setting. By allowing coolant to flow through the block sooner, it helps stabilize lower temperatures in high-stress environments such as hot climates, heavy towing, or modified performance builds.

The assembly includes a pre-installed thermostat in a stock-style housing to ensure a leak-free seal and a straightforward installation process using factory mounting points. This component is essential for drivers looking to improve cooling system reliability and prevent the internal damage associated with excessive heat soak.

• Direct-fit for select 2003-2024 Toyota 4.0L engines
• Activation Temperature: 71°C (160°F)
• OEM Activation Temperature: 82°C (180°F)
• Includes pre-installed thermostat in a durable stock-style housing
• Ideal for towing, racing, or hot-weather driving
• Manufacturer Part Number: MMTS-4RUN40-03
• Mishimoto Lifetime Warranty included