Mishimoto Thermostat

2007–2018 Jeep Wrangler

Part #: MMTS-WRA-12E

Overview

The Mishimoto 90 Degree Thermostat with Aluminum Housing is a premium cooling system upgrade designed specifically for the 2007–2018 Jeep Wrangler. Engineered to maintain optimal engine temperature, this thermostat helps prevent overheating and ensures consistent coolant flow under a wide range of operating conditions. Ideal for Jeep enthusiasts seeking reliable performance and enhanced durability, this thermostat offers a direct-fit replacement that preserves factory temperature settings for proper engine operation.

Whether you are tackling off-road trails or navigating daily commutes, maintaining the correct engine temperature is critical for maximizing efficiency and longevity. Mishimoto’s thermostat provides peace of mind by combining robust construction with precise thermal control, making it a dependable choice for Wrangler owners looking to upgrade their cooling system components.

Key Features

This thermostat incorporates advanced design elements and high-quality materials to deliver superior performance and reliability:

• Opens at approximately 90 degrees Celsius, matching near-stock temperature for optimal coolant flow and engine temperature regulation
• Durable aluminum housing resists corrosion and improves heat dissipation compared to standard plastic housings
• Includes a galvanized steel bleeder screw for a tighter seal and simplified bleeding of air from the cooling system
• Precision-engineered valve ensures smooth and consistent operation under all driving conditions
• Direct-fit design for 2007–2018 Jeep Wrangler models, requiring no modifications for installation
• Backed by the Mishimoto Lifetime Warranty, reflecting confidence in long-term durability and performance
• Helps prevent overheating and engine damage by maintaining stable operating temperatures
• Compatible with OEM cooling system components for seamless integration

Construction & Design

The thermostat features a rugged aluminum housing that offers superior strength and thermal conductivity compared to traditional plastic housings. This upgrade reduces the risk of cracks, leaks, and warping caused by prolonged exposure to high temperatures and harsh environments. The aluminum construction also aids in dissipating heat more efficiently, contributing to improved cooling system performance.

The valve mechanism is engineered for precise temperature activation, opening near the factory-specified 90°C threshold to ensure proper coolant circulation. The inclusion of a galvanized steel bleeder screw enhances sealing integrity and facilitates easier maintenance by allowing trapped air to be released from the system, preventing air pockets that can impair cooling efficiency.

Installation & Fitment

Designed as a direct replacement for the factory thermostat in 2007–2018 Jeep Wrangler models, installation is straightforward and requires no special tools or modifications. The thermostat fits seamlessly into the existing cooling system housing, making it an ideal upgrade for both professional mechanics and DIY enthusiasts. Proper installation ensures reliable engine temperature regulation and helps maintain the longevity of your Jeep’s engine.

What's Included

• Mishimoto 90 Degree Thermostat with Aluminum Housing
• Galvanized steel bleeder screw
• Installation instructions

Ideal For

This thermostat is perfect for Jeep Wrangler owners who want to enhance their vehicle’s cooling system durability and reliability. It is especially suited for those who frequently drive in demanding conditions, including off-road adventures, hot climates, or heavy towing scenarios. Anyone looking to replace a worn or failing thermostat with a high-quality, long-lasting component will benefit from this Mishimoto upgrade.

Mishimoto is a performance cooling brand offering aluminum radiators, intercoolers, oil coolers, hoses, and supporting hardware built to manage heat on hard-driven street and track vehicles. For boosted setups and towing/off-road rigs alike, Mishimoto upgrades are designed to increase cooling capacity and reliability where factory systems can become a limitation.