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Mishimoto Mishimoto 2003+ Toyota 4Runner 4.0L Low-Temperature Racing Thermostat
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Mishimoto 2003+ Toyota 4Runner 4.0L Low-Temperature Racing Thermostat

Mishimoto
MISMMTS-4RUN40-03
811580034282
Thermostats
20+ Units In Stock - Ships Next Business Day
$ 99.00 $ 89.95
$ 89.95

SKU: MMTS-4RUN40-03 | UPC: 811580034282

Mishimoto 2003+ Toyota 4Runner 4.0L Low-Temperature Racing Thermostat

Replace your stock thermostat in 2003-2021 Toyota 4Runner 4.0L 2007-2014 FJ Cruiser and 2005-2008 Tacoma 4.0L with the Mishimoto low-temperature racing thermostat and housing. This direct-fit unit activates at 71C/160F versus OEM 82C/180F to circulate coolant sooner and keep engine temperatures lower. Perfect for hot weather high-power builds or heavy towing it installs with stock-style sealing and carries Mishimoto Lifetime Warranty.

Key Features

  • Lower Activation Temperature: Opens at 71C/160F 11C/20F below OEM for faster coolant flow and sustained lower engine operating temperatures
  • Direct-Fit Replacement: Matches OEM dimensions for plug-and-play installation on 4.0L 1GR-FE engines without modifications
  • CNC Aluminum Housing: Anodized black finish resists corrosion provides reliable seal and enhances cooling system durability
  • Performance Cooling: Reduces risk of overheating in demanding conditions like towing track use or modified engines
  • Lifetime Warranty: Backed by Mishimoto engineering for long-term reliability on all compatible Toyota models

Product Notes

  • Drain coolant before installation to avoid spills and contamination
  • Use high-quality coolant compatible with aluminum components for best results
  • Ships in protective packaging to prevent damage during transit

Installation Notes

  • Professional installation recommended.
  • Requires removal of stock thermostat housing and O-ring replacement included
  • Compatible with OEM hardware torque to factory specs 22 ft-lbs

This Part Fits

Year Make Model Submodel
2003-2021 Toyota 4Runner Limited
2020-2021 Toyota 4Runner Nightshade
2003-2009 Toyota 4Runner Sport
2003-2021 Toyota 4Runner SR5
2018-2021 Toyota 4Runner SR5 Premium
2010-2016,2021 Toyota 4Runner Trail
2017-2021 Toyota 4Runner TRD Off-Road
2018-2021 Toyota 4Runner TRD Off-Road Premium
2015-2021 Toyota 4Runner TRD Pro
2020-2021 Toyota 4Runner Venture
2007-2014 Toyota FJ Cruiser Base
2008 Toyota FJ Cruiser Trail Teams Special Edition
2007 Toyota FJ Cruiser TRD Special Edition
2005-2008 Toyota Tacoma Base
2005-2008 Toyota Tacoma Pre Runner
2005-2008 Toyota Tacoma X-Runner

Why Choose Mishimoto?

  • Proven leader in automotive cooling solutions for Toyota enthusiasts
  • Direct-fit parts tested for real-world performance gains
  • Engineered with precision CNC machining for exact OEM compatibility

Frequently Asked Questions

  • Q: Will this fit my 2015 Toyota 4Runner TRD Pro 4.0L?
    A: Yes it is a direct replacement for all 2003-2021 4Runner 4.0L V6 models including TRD Pro with 1GR-FE engine
  • Q: What material is the thermostat housing?
    A: High-quality CNC machined aluminum with black anodized finish for corrosion resistance and heat dissipation
  • Q: Does it include warranty and what does it cover?
    A: Lifetime Warranty covers defects in materials and workmanship for the original purchaser on thermostat and housing

Shipping & Handling

  • Method: UPS Ground or USPS Priority
  • Availability: In stock - ships same or next business day
  • Packaging: Secure box 7.6 x 5.4 x 3.5 inches
  • Weight: 14.4 ounces

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