Keep your Gen 3 HEMI operating cooler with the Mishimoto 180 Degree Racing Thermostat, part number MMTS-JED-06L. Designed specifically for 5.7L, 6.1L, 6.4L, and supercharged 6.2L HEMI engines, this low-temperature thermostat begins opening at 180°F compared to the 203°F activation temperature of the factory thermostat. Opening earlier allows coolant to begin circulating through the engine sooner, helping reduce and maintain lower engine temperatures once the vehicle reaches operating temperature. Whether your HEMI is stock, cammed, or supercharged, improved cooling efficiency can be a valuable addition to a street-driven or performance-focused combination.

Heat management becomes increasingly important as horsepower and vehicle demands increase. Aggressive driving, hot summer temperatures, repeated drag strip passes, towing, and performance modifications can all place additional demands on the factory cooling system. By lowering the thermostat’s activation temperature, the Mishimoto Racing Thermostat allows the cooling system to begin working earlier instead of waiting for the higher factory opening point. This makes it a popular supporting modification for Gen 3 HEMI owners looking to improve temperature management without replacing the entire cooling system.

One of the biggest advantages of this thermostat is its broad HEMI compatibility. Mishimoto lists applications across Dodge, Chrysler, Jeep, and Ram platforms, including popular vehicles such as the Challenger, Charger, Durango, Grand Cherokee, Wrangler 392, Ram 1500, and Chrysler 300. Engine compatibility includes the naturally aspirated 5.7L, 6.1L, and 6.4L HEMI, along with the 6.2L Supercharged HEMI found in applications such as the Hellcat, Trackhawk, Durango Hellcat, and Ram TRX. Exact model-year compatibility varies by platform, so fitment should always be confirmed before ordering.

Installation is straightforward, with Mishimoto rating the job as Easy and listing a single thermostat as the included component. This makes the 180-degree thermostat a practical addition during cooling system maintenance or while completing other Gen 3 HEMI performance upgrades. For modified vehicles, appropriate ECU calibration and fan settings may also be necessary to take full advantage of the lower thermostat opening temperature and achieve the desired cooling strategy.

For enthusiasts building everything from a daily-driven 5.7L HEMI to a modified Scat Pack or high-horsepower Hellcat, the Mishimoto 180 Degree Racing Thermostat provides an affordable way to improve cooling system operation. Its lower 180°F activation temperature, broad Gen 3 HEMI compatibility, simple installation, and Mishimoto Lifetime Warranty make it an excellent supporting upgrade for vehicles where controlling engine temperature is a priority.

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Specifications & Features

• Brand: Mishimoto
• Manufacturer Part Number: MMTS-JED-06L
• Product Type: Low-Temperature Racing Thermostat
• Activation Temperature: 180°F
• OEM Activation Temperature: 203°F
• Temperature Difference: 23°F lower than OEM
• Designed to allow coolant circulation earlier
• Helps maintain cooler engine operating temperatures
• Designed for stock, cammed, and supercharged applications
• Engine Compatibility: 5.7L HEMI, 6.1L HEMI, 6.4L HEMI, and 6.2L Supercharged HEMI
• Vehicle Compatibility: Select Chrysler 300, Chrysler Aspen, Dodge Challenger, Dodge Charger, Dodge Durango, Dodge Magnum, Jeep Commander, Jeep Grand Cherokee, Jeep Grand Cherokee L, Jeep Grand Wagoneer, Jeep Wagoneer, Jeep Wrangler 392, Dodge Ram, Ram 1500, Ram 1500 Classic, Ram 2500, and Ram 3500 applications
• Year Compatibility: Approximately 2004-2023+, depending on vehicle and engine application
• Hellcat Compatibility: 2015-2023 Challenger and Charger 6.2L applications
• Trackhawk Compatibility: 2018-2021 Jeep Grand Cherokee 6.2L
• Ram TRX Compatibility: 2021+ Ram 1500 6.2L
• Durango Hellcat Compatibility: 2021 and 2023+ 6.2L applications
• Size: Direct-fit OEM-style thermostat
• Weight: Not specified by manufacturer
• Material: Automotive-grade thermostat construction
• Color: Metallic / Brass, appearance may vary
• Parts Included: (1) Mishimoto Thermostat
• Installation Difficulty: Easy
• Intended Use: Daily driving, street performance, drag racing, modified engines, cooling system upgrades, and high-performance Gen 3 HEMI builds
• Warranty: Mishimoto Lifetime Warranty