Mishimoto MMTS-FIST-14 Low Temp Thermostat for 2014-2019 Ford Fiesta ST 1.6L

Vehicle Fitment

• 2014-2019 Ford Fiesta ST (1.6L EcoBoost, turbocharged)

Features

• Direct-fit low-temperature racing thermostat for Ford Fiesta ST
• Activates coolant flow at 160 °F vs. stock 207 °F for improved cooling
• Reduces overall engine operating temperature under load
• Beneficial for track use, spirited driving, and performance tuning
• Works seamlessly with stock cooling system and Mishimoto cooling upgrades
• Includes Mishimoto Lifetime Warranty for long-term reliability
• High-quality internal components including precision spring and plate
• O-rings included for proper sealing and leak-free installation

Specifications

• Part Number: MMTS-FIST-14
• Thermostat Activation Temperature: 160 °F (71 °C)
• OEM Activation Temperature: 207 °F (97 °C)
• Engine Compatibility: 1.6L EcoBoost turbocharged
• Chassis Code: B3 platform
• Fitment Years: 2014-2019 Ford Fiesta ST
• Fitment Position: Engine cooling thermostat housing

Included Components

• 1x Mishimoto low-temp thermostat (MMTS-FIST-14)
• 1x Spring plate
• 1x Internal spring
• 2x Rubber O-rings

Product Description

The Mishimoto MMTS-FIST-14 Low Temperature Thermostat is engineered for the performance-oriented owner of the Ford Fiesta ST equipped with the 1.6L EcoBoost engine. This racing thermostat opens at a cooler 160 °F compared to the stock 207 °F unit, allowing coolant to begin circulating earlier and reducing peak engine temperatures during hard acceleration and track sessions. Lower operating temperatures help preserve engine longevity under sustained performance use and can synergize with other cooling upgrades such as Mishimoto radiators or intercoolers.

Installation is designed to be direct-fit into the stock thermostat housing (requires removal of existing unit), with included spring, plate, and O-rings for a proper, leak-free seal. Backed by Mishimoto's Lifetime Warranty, this thermostat is ideal for Fiesta ST owners seeking more consistent cooling performance during hot weather, aggressive driving, or performance modifications.