Racing Thermostat & Housing

Name: Racing Thermostat & Housing
Brand: MISHIMOTO
SKU: 690-MMTS4RUN4003
Price: 89.95 USD
Availability: InStock

^$89⁹⁵

Ships on 09/08/2026

Lowest Price Guarantee

Toyota

Racing Thermostat & Housing

2003-2019 Toyota 4Runner 4.0L

Low-Temperature, 160 Degrees Fahrenheit Activation

Mishimoto 690-MMTS-4RUN40-03 Features:

A defective thermostat can result in engine overheating and potential internal damage. Improve the reliability of your 2003-2024 Toyota 4Runner 4.0L cooling system with a Mishimoto Low-Temperature Racing Thermostat and housing! This thermostat is designed as a direct-fit replacement for your aged stock unit. The Mishimoto thermostat has a lower activation temperature (71?C/160?F) compared to the factory thermostat (82?C/180?F). The lower activation temperature allows coolant to flow through the engine earlier, which reduces and maintains lower engine temperatures. This thermostat is ideal for use in warmer climates, on vehicles making more power than stock, or under extreme towing/driving conditions. The stock-style housing will provide a proper seal and installs easily. Like all our Toyota Performance parts, this thermostat and housing includes the Mishimoto Lifetime Warranty.A defective thermostat can result in engine overheating and potential internal damage. Improve the reliability of your 2003+ Toyota 4Runner 4.0L cooling system with a Mishimoto Low-Temperature Racing Thermostat and housing! This thermostat is designed as a direct-fit replacement for your aged stock unit. The Mishimoto thermostat has a lower activation temperature (71?C/160?F) compared to the factory thermostat (82?C/180?F). The lower activation temperature allows coolant to flow through the engine earlier, which reduces and maintains lower engin e temperatures. This thermostat is ideal for use in warmer climates, on vehicles making more power than stock, or under extreme towing/driving conditions. The stock-style housing will provide a proper seal and installs easily. Like all our Toyota Performance parts, this thermostat and housing includes the Mishimoto Lifetime Warranty.

Stock-style housing includes pre-installed low-temperature thermostat for easy install
Direct fit for 2003+ Toyota 4Runner 4.0L
The lower activation temperature allows coolant to flow through the engine earlier, which reduces and maintains lower engine temperatures. (71C/160F compared to the factory thermostat at 82C/180F)
Ideal for use in hot climates, on modified vehicles, or in extreme towing/driving conditions
The lower activation temperature allows coolant to flow through the engine earlier, which yields and maintains lower engine temperatures (71?C/160?F compared to the factory thermostat at 82?C/180?F)
Mishimoto Lifetime Warranty

Part TypeThermostat

BrandMISHIMOTO

Package Height4.0

Package Width4.0

Package Length6.0

Weight1.0 PG

Part CategoryPerformance Parts

Part FitmentDirect Fit

Start To Open Temperature (C)71

Vendor Part NumberMMTS-4RUN40-03

Package Qty1

Package TypeEA