AISIN Engine Coolant Thermostat THT-017 with Housing — OE-matched for Lexus CT200h & Toyota Prius/Corolla

This AISIN thermostat assembly replaces the thermostat and housing in one complete unit, engineered to match original-equipment specifications for temperature, fit, and durability. Built with OE-grade materials and manufacturing methods, the THT-017 helps the cooling system reach and maintain the correct operating temperature while fitting directly into the factory mounting points for a straightforward installation.

How does this thermostat affect engine temperature management?

The thermostat regulates coolant flow between the engine and radiator, opening at the specified OE temperature so your engine warms up efficiently and stays within its designed temperature range. Using the correct thermostat helps avoid prolonged warm-up times and reduces stress from overheating or running too cool.

• OE-specified opening temperature for consistent coolant control
• Precision valve and wax-element construction for reliable operation
• Complete housing included to ensure proper seal and alignment

Will the AISIN THT-017 fit my vehicle and how do I confirm compatibility?

Fitment covers a range of Lexus CT200h and select Toyota Corolla and Prius variants, but engine type and model year can affect compatibility. Always verify fitment using your vehicle VIN or the seller’s fitment checker before purchase to confirm this part replaces your OEM thermostat and housing.

• Listed compatible models: Lexus CT200h (2011–2017)
• Toyota models: Corolla (2020–2022), Prius series (2010–2022), AWD-e, Plug-In, Prime, and Prius V variants
• Check engine code and VIN-based fit tools to ensure proper match

What are the advantages of choosing an OE-matched AISIN thermostat?

AISIN designs this thermostat to mirror the original part’s form, fit, and function so it integrates seamlessly with the vehicle’s cooling system. The high-quality materials and precise manufacturing reduce the likelihood of premature failure, leaks, or improper temperature regulation compared with lower-grade replacements.

• OE-matched design for direct replacement without modification
• Durable housing and components to withstand coolant and temperature cycles
• Helps maintain manufacturer-intended engine efficiency and emissions behavior

How difficult is installation and what should I expect during replacement?

Installation is typically straightforward for experienced DIYers and professional technicians because the assembly is supplied as a single unit with the housing. Expect to drain some coolant, remove the old thermostat housing, transfer any necessary sensors, and replace with the AISIN unit using new seals or gaskets.

• Includes thermostat and housing to simplify replacement steps
• May require coolant drain and refill, torque to factory spec, and system bleed
• Recommended: inspect hoses and coolant condition while replacing the thermostat

Who is this for: The AISIN THT-017 thermostat with housing is aimed at owners and technicians maintaining Lexus CT200h and compatible Toyota Corolla and Prius models who want an exact OE-matched replacement. It suits people replacing a failed or aging thermostat, performing routine cooling-system maintenance, or restoring factory performance after engine repairs. Verify vehicle fitment before ordering to ensure the part matches your model year and engine variant.