AISIN THH-003 Engine Coolant Thermostat Assembly for Acura/Honda — Complete Kit with Housing & Gasket, OE-Matched

AISIN THH-003 is a complete replacement engine coolant thermostat assembly (thermostat, housing, gasket) engineered to match original equipment performance in select Acura and Honda vehicles.

This AISIN OE-matched thermostat assembly restores proper cooling system control by opening and closing at the factory-specified temperature. The kit includes the thermostat, the molded housing, and a precision gasket so you replace the whole assembly at once — reducing leak risk and simplifying installation. AISIN designs these components to meet original fit, function, and temperature characteristics, using durable materials intended for reliable service life.

How does this thermostat assembly affect engine temperature control?

Replacing a worn thermostat with the AISIN THH-003 helps ensure the cooling system opens at the correct temperature so the engine reaches and maintains optimal operating range. That steady regulation supports consistent heater performance and helps prevent prolonged overheating or overcooling situations.

• OE-specified opening temperature for accurate thermal control
• Complete assembly (thermostat, housing, gasket) reduces leak points
• Engine-specific fit limits incorrect operation from mismatched parts

Is the AISIN THH-003 easy to install and what comes in the kit?

The kit is designed as a direct-replacement assembly so most technicians and experienced DIYers can swap it without adapting additional parts. Because AISIN supplies the housing and gasket with the thermostat, you avoid reusing aged seals that commonly cause coolant leaks after service.

• Includes thermostat, molded housing, and matching gasket
• Designed for OE form, fit and function to simplify installation
• Installation typically requires standard hand tools and basic coolant handling

Which vehicles is this thermostat compatible with and how do I verify fit?

The THH-003 fits specific Acura and Honda model years but engine variations can affect compatibility. Always confirm fitment using your vehicle’s VIN or the seller’s fitment checker before ordering to ensure correct match for engine and model year.

• Compatible examples: Acura ILX (2013–2015), Acura TSX (2004–2008)
• Compatible examples: Honda Civic (2006–2015), Honda CR-V (2007–2008, 2010–2014)
• Verify fitment by VIN or OEM part cross-reference to avoid mismatch

What materials and quality controls does AISIN apply to this part?

AISIN produces OE-matched components using engineered materials and production methods intended to meet manufacturer tolerances. The THH-003 assembly follows AISIN’s specifications for temperature response and mechanical durability to provide a long-lasting replacement option.

• Manufactured to OE specifications for temperature and dimensions
• Durable housing and gasket materials to resist coolant exposure
• Quality controls aligned with AISIN’s automotive supply standards

Who is this for: Technicians and vehicle owners who need a dependable, OE-matched thermostat replacement for compatible Acura ILX and TSX or Honda Civic and CR-V models. This kit is ideal when you want a complete thermostat service solution — thermostat, housing, and gasket included — to reduce installation steps and minimize post-service coolant leaks. Verify vehicle application before purchase to ensure correct fit for your engine and model year.