AISIN Engine Coolant Thermostat THM-011 with Gasket - Direct Fit for Infiniti/Nissan/Mitsubishi, OE Temperature Match

The AISIN THM-011 is an OE-matched engine coolant thermostat with gasket designed to restore proper coolant flow and factory operating temperature control on compatible Infiniti, Nissan and Mitsubishi vehicles.

This AISIN thermostat replicates original equipment form, fit and operating temperature to help your engine reach and maintain optimal running temperature. Manufactured to OE standards using quality materials, the THM-011 includes the thermostat assembly and a gasket/O-ring so you can replace the worn factory part with a direct-fit component. Fitment covers a range of Infiniti models (FX, M, Q, QX series), select Mitsubishi vehicles (Eclipse, Outlander, Montero, Diamante, Galant) and Nissan trucks/vans (Armada, Titan, NV series, Pathfinder); engine variations can affect compatibility, so verify with your vehicle’s details before ordering.

How does this thermostat affect engine warm-up and temperature control?

The thermostat opens and closes based on coolant temperature, regulating flow to the radiator and helping the engine reach its correct operating temperature more quickly. A properly functioning thermostat prevents prolonged cold running and reduces the risk of overheating by allowing coolant circulation when needed. AISIN designs the THM-011 to match the OE specified opening temperature so it behaves like the original part.

• OE-specified operating temperature for consistent performance
• Precision valve action for reliable open/close response
• Durable materials to resist sticking and corrosion
• Includes gasket/O-ring for proper sealing during installation

Will this thermostat fit my vehicle and how do I confirm compatibility?

The THM-011 is compatible with many Infiniti, Nissan and Mitsubishi models, but fit can depend on model year and engine variant. Use the vehicle fitment checker on the product page or compare the OEM part number to ensure a match. If your vehicle isn’t listed exactly, check engine code or consult a parts specialist to confirm fitment.

• Compatible with multiple Infiniti models: FX45/FX50, M45/M56, Q45/Q70/Q70L, QX56/QX70/QX80
• Mitsubishi coverage includes Diamante, Eclipse, Galant, Montero, Montero Sport, Outlander
• Nissan coverage includes Armada, NV2500/3500, Pathfinder, Titan
• Verify with the fitment tool or OEM part number before purchase

What comes in the package and what should I expect during installation?

The package contains the AISIN thermostat assembly and the matching gasket/O-ring needed for a proper seal. Installation is a straightforward replace-the-old-unit task for most mechanically inclined owners or a routine job for a professional technician. Always drain coolant to the appropriate level, replace the thermostat and gasket, then refill and bleed the cooling system following vehicle manufacturer procedures.

• Includes thermostat and gasket/O-ring for one complete replacement
• OE-matched shape and mounting points for direct-fit installation
• Follow vehicle-specific coolant drain and bleed steps to avoid air pockets
• Recommended to inspect hoses, housing and coolant condition during replacement

How does AISIN quality compare to factory parts?

AISIN supplies many original equipment manufacturers and produces aftermarket parts to OE tolerances, focusing on consistent materials and dimensional accuracy. The THM-011 is built to match the original thermostat’s operating temperature and fit so it behaves like the factory component. Choosing an OE-matched replacement reduces variability and helps maintain expected engine temperature management.

• Engineered to OE form, fit and function for dependable performance
• Manufactured using high-quality materials for long service life
• Designed to meet the same operating temperature specification as OEM parts
• Backed by AISIN’s automotive manufacturing experience and standards

Who is this for: The AISIN THM-011 is intended for owners and mechanics who need a reliable, OE-matched replacement thermostat for compatible Infiniti, Nissan and Mitsubishi vehicles. It’s well suited for routine cooling-system maintenance, restoration of correct engine warm-up behavior, and for anyone replacing a thermostat that is sticking, stuck open/closed, or otherwise failing. Confirm fitment for your specific model and engine before ordering to ensure a direct replacement.