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Mishimoto Low-Temp Racing Thermostat - MMTS-4RUN40-03
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 Degree Degree C/160 Degree Degree F) compared to the factory thermostat (82 Degree Degree C/180 Degree Degree 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.

Purchase Includes:
  • (1) Mishimoto Low-Temp Thermostat
  • (1) Thermostat Housing w/o-Ring
  • Mishimoto Lifetime Warranty


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


Specifications:
  • Mishimoto Activation Temperature Degree F: 160
  • OEM Activation Temperature Degree F: 180


Fitment:
  • Toyota 4Runner Base 2020-2021
  • Toyota 4Runner Limited 2003-2021
  • Toyota 4Runner Nightshade 2020-2021
  • Toyota 4Runner Sport 2003-2009
  • Toyota 4Runner SR5 2003-2021
  • Toyota 4Runner SR5 Premium 2018-2021
  • Toyota 4Runner Trail 2010-2021
  • Toyota 4Runner TRD Off-Road 2017-2021
  • Toyota 4Runner TRD Off-Road Premium 2018-2021
  • Toyota 4Runner TRD Pro 2015-2021
  • Toyota 4Runner Venture 2020-2021
  • Toyota FJ Cruiser Base 2007-2014
  • Toyota FJ Cruiser Core 2009
  • Toyota FJ Cruiser Premium 2008-2014
  • Toyota FJ Cruiser Trail Teams Special Edition 2008
  • Toyota FJ Cruiser TRD Special Edition 2007
  • Toyota Tacoma Base 2005-2008
  • Toyota Tacoma Base Prerunner 2006
  • Toyota Tacoma Pre Runner 2005-2008
  • Toyota Tacoma SR5 Prerunner 2006-2008
  • Toyota Tacoma TRD Sport Prerunner 2006-2008
  • Toyota Tacoma X-Runner 2005-2008
  • Engine Codes: 4.0L V6

Other Part Numbers:
Mishimoto #misMMTS-4RUN40-03

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

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Who is Mishimoto?

Mishimoto is an aftermarket automotive company that was established in 2005. They are known for creating the industry’s best performing cooling system components. Today, they have become the market leader and has been chosen by various enthusiasts worldwide.

Parts for All Your Cooling Needs

Mishimoto offers a wide range of products such as couplings, radiators, fans, and other cooling system components for practically every vehicle, may it be a sport compact, truck, jeep, muscle cars, and classic vehicles. They also offer intake systems and intercoolers that help the vehicle gain more horsepower.

Built to Perform Better

The company creates products that are better than the stock components. Their parts are designed to work in higher pressure ratings and are more robust. Hence, they are the brand of choice by tuners and enthusiasts who demand a cooling system that can work for high-performance applications. Many racers choose Mishimoto as it has proven itself to produce race winners whatever racing discipline it is, may it be circuit racing, drag racing, drifting, and off road racing.

Purchase Mishimoto Products at Vivid Racing

Your vehicle cooling system plays a critical role in your vehicle. It keeps the temperature at bay and prevents severe damages caused by overheating. If you want a product that can put your trust in, then Mishimoto is the brand for you. Tested by many racers on the track and a variety of car enthusiasts on the street, you can be sure that you will never go wrong with Mishimoto.

Visit Vivid Racing and check out their list of products that would fit your specific needs.











Mishimoto Automotive ("Mishimoto") warrants its products under this lifetime limited warranty policy ("Warranty Policy"). This Warranty Policy applies solely to: (i) Mishimoto Products purchased directly from Mishimoto or Mishimoto authorized dealers (each a "Mishimoto Product" and collectively, the "Mishimoto Products") and (ii) the original purchaser of such Mishimoto Product ("Purchaser"). This Warranty Policy is non-transferable and all claims under this Warranty Policy must be accompanied by the original sales receipt. The terms and conditions of this Warranty Policy are subject to change by Mishimoto at any time without notice.

Pursuant to the terms and conditions of this Warranty Policy, after submission of a valid claim by a Purchaser and regardless of the condition of the product for which such valid claim is submitted, if it is determined by Mishimoto that such Mishimoto Product was not manufactured to Mishimoto's advertised specifications or if such claim was submitted pursuant to Mishimoto's Accident Protection Plan, as described herein, Mishimoto will, at its discretion: (i) repair or replace Purchaser's original Mishimoto Product; (ii) replace Purchaser's original Mishimoto Product with the most current available model (if, for example, the original model of the product for which a valid claim has been submitted is not available); or (iii) provide the purchaser with a gift card redeemable at Mishimoto.com in the amount of the original purchase price of the original Mishimoto Product (if, for example, Mishimoto has discontinued support for a Purchaser's specific application).

To submit a claim for a Mishimoto Product under this Warranty Policy, you must: (i) fully and accurately fill out the online form provided below; and (ii) provide Mishimoto with a copy of an original sales receipt indicating that you are the original Purchaser of the Mishimoto Product for which the claim is being submitted (you must also provide the information described in the paragraph of this Warranty Policy titled "Mishimoto Accident Protection Plan" if you are submitting a claim for a Mishimoto Product damaged in an accident). In addition, if requested by Mishimoto, you must also send the Mishimoto Product for which a claim is being made, all transportation expenses prepaid, to Mishimoto.
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Things
Sale price None
Wholesale price $84.91
Shipping Weight: 0.60
Length: 6
Width: 4
Height: 3
Product Added At Tuesday 14 July, 2020
Product Modified At Friday 11 July, 2025
Imported By ETLOverride
Last Edited By Turn_API
View In Admin

Emissions Info
Carb Approved Yes
Carb Number -
Epa Status N/A
Prop65 Unknown
Carb Required -
Vendors
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Vendor Inv Cost Retail Jobber MAP Core Updated
Turn 14 $71.96 $99.00 ? $89.95 ? 2025-07-11 10:34:09


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