AISIN THH-003 Engine Coolant Thermostat Assembly with Housing & Gasket — OE Fit for Acura/Honda

The AISIN GENUINE THH-003 is a complete replacement engine coolant thermostat assembly—thermostat, housing, and gasket—engineered to restore proper engine temperature control on compatible Acura and Honda vehicles.

This AISIN unit is made to match original equipment specifications so the cooling system operates as intended. Built from durable materials and engineered to the correct operating temperature, the THH-003 helps the engine reach and maintain its designed temperature range for steady performance and efficient warm-up. AISIN’s long history in OE parts manufacturing backs the fit, function, and reliability of this assembly.

How does the AISIN THH-003 restore cooling-system performance?

Replacing a failing thermostat with a correctly specified AISIN assembly helps the engine reach proper operating temperature and keeps coolant flow regulated. The included housing and gasket simplify installation and reduce leak risk compared with installing only the thermostat itself.

• Thermostat calibrated to original equipment operating temperature.
• Complete kit includes housing and sealing gasket for a tight fit.
• Manufactured to meet OE form, fit, and function expectations.

Which vehicles will this thermostat assembly fit?

The THH-003 is designed for select Acura and Honda models; engine variations can affect compatibility, so always confirm fitment for your VIN or use a fitment checker before purchasing. Typical compatible models include certain years of the Acura ILX and TSX, and Honda Civic and CR-V.

• Acura ILX: select 2013–2015 model years.
• Acura TSX: select 2004–2008 model years.
• Honda Civic: select 2006–2015 model years.
• Honda CR-V: select 2007–2008 and 2010–2014 model years.

What are the installation and maintenance considerations?

Installation replaces the thermostat, housing, and gasket—typically a straightforward repair for mechanically inclined owners or a quick job for a professional technician. Use new coolant and bleed the cooling system per manufacturer procedures to avoid air pockets and ensure proper temperature control after installation.

• Includes housing and gasket to minimize additional parts needed.
• Recommended to replace coolant when replacing thermostat for best results.
• Follow vehicle-specific torque and bleeding procedures to prevent leaks and air entrapment.

Who is this for? The AISIN THH-003 thermostat assembly is intended for owners, mechanics, and fleet managers who need a reliable, OEM-matched replacement for cooling-system service on compatible Acura and Honda vehicles. It’s especially suited for vehicles showing symptoms of thermostat failure—extended warm-up times, engine overheating under load, or temperature gauge fluctuation—or for preventive maintenance when the original thermostat’s service life has been reached. For best results, verify fitment against your vehicle’s engine code or VIN before ordering and follow recommended installation and coolant-handling practices.