Mishimoto MMTS-F2D-11L Low-Temp Thermostat for 2011-2022 Ford F-250/F-550 6.7L

Vehicle Fitment

• 2011-2022 Ford F-250 Super Duty (XL, XLT, Lariat, King Ranch, Platinum, Limited, Tremor, 6.7L Powerstroke Diesel, 2WD/4WD)
• 2011-2022 Ford F-350 Super Duty (XL, XLT, Lariat, King Ranch, Platinum, Limited, Tremor, 6.7L Powerstroke Diesel, 2WD/4WD, SRW/DRW)
• 2011-2022 Ford F-450 Super Duty (XL, XLT, Lariat, King Ranch, Platinum, Limited, 6.7L Powerstroke Diesel)
• 2011-2022 Ford F-550 Super Duty (XL, XLT, Lariat, 6.7L Powerstroke Diesel)

Fitment Notes

• This is the Primary (Main Engine) Cooling System thermostat - it fits the main engine thermostat location, not the secondary or inner low-temp radiator thermostat positions.
• The 6.7L Powerstroke (2011-2022) uses a dual-thermostat cooling architecture; this part replaces the primary/main thermostat only. The secondary (inner) thermostats require a separate part.
• Fits the 6.7L Powerstroke diesel engine only - does not fit 6.0L, 6.4L, or 7.3L Powerstroke applications.
• Compatible with stock and upgraded cooling systems including aftermarket primary radiators.
• Frame constructed from high-grade stainless steel; valve assembly uses copper alloy for corrosion resistance and proper heat conduction.

Features

• Dual-stage lower activation temperatures of 189°F (start-to-open) and 196°F (fully open) versus OEM at 194°F/201°F - coolant circulates sooner for improved heat management.
• Ideal for warm and hot climates where the factory thermostat allows engine temperatures to rise too high under towing or high-load driving conditions.
• Recommended for trucks with power-increasing modifications (tunes, injectors, turbos) that generate additional heat requiring proactive thermal management.
• Designed and manufactured to OE specifications for a factory-fit installation with no modifications required.
• High-grade stainless steel frame provides exceptional durability and resistance to corrosion in harsh operating environments.
• Copper alloy valve assembly ensures reliable heat conduction and consistent thermostat actuation across the full temperature range.
• Factory-style O-ring included for a secure, leak-free seal upon installation.
• Backed by Mishimoto's Lifetime Warranty for long-term reliability and peace of mind.

Specifications

• Part Number: MMTS-F2D-11L
• Mishimoto Start-to-Open Temperature: 189°F (87°C)
• Mishimoto Fully Open Temperature: 196°F (91°C)
• OEM Start-to-Open Temperature: 194°F (90°C)
• OEM Fully Open Temperature: 201°F (94°C)
• Frame Material: High-Grade Stainless Steel
• Valve Assembly Material: Copper Alloy
• Engine Application: Ford 6.7L Powerstroke Diesel, Turbocharged V8
• Thermostat Position: Primary / Main Engine Cooling Circuit
• Fitment Type: Direct OE Replacement
• Package Dimensions: 6" (L) x 4" (H) x 3" (W)
• Shipping Weight: 1.0 lb

Included Components

• 1x Mishimoto Low-Temperature Primary Thermostat
• 1x Factory-Style O-Ring

Product Description

The Mishimoto MMTS-F2D-11L is a low-temperature primary cooling system thermostat engineered as a direct-fit OE replacement for 2011-2022 Ford F-250, F-350, F-450, and F-550 Super Duty trucks equipped with the 6.7L Powerstroke diesel engine. Unlike the factory primary thermostat, which begins to open at 194°F and reaches full flow at 201°F, the Mishimoto unit starts opening at 189°F and reaches full flow at 196°F. This earlier activation allows coolant to begin circulating through the primary cooling circuit sooner, reducing the overall engine operating temperature and providing additional thermal headroom for demanding use cases. The result is a cooler, more consistent engine temperature profile - particularly valuable in warm climates, during extended towing, and in trucks with performance tunes or upgraded fueling systems that push the engine harder than stock.

The 6.7L Powerstroke uses a dual-thermostat cooling architecture, and this part addresses the primary/main engine thermostat location specifically. It is built to OE dimensional specifications, with a high-grade stainless steel frame for durability and a copper alloy valve assembly for reliable, corrosion-resistant heat conduction. A factory-style O-ring is included for a proper seal at installation. No modifications to the cooling system, plumbing, or engine components are required - the MMTS-F2D-11L is a true drop-in replacement that installs in approximately one hour.

This thermostat is a strong first step in a complete 6.7L Powerstroke cooling system upgrade and pairs particularly well with the Mishimoto 6.7L Powerstroke Aluminum Primary Performance Radiator for owners looking to maximize thermal management from end to end. Whether you run your Super Duty hard on the job, tow heavy loads regularly, or simply want to protect a modified engine against heat-related wear, the MMTS-F2D-11L delivers a verified, warranty-backed solution. All components are covered by Mishimoto's Lifetime Warranty.