APSG 90916-A3003 Thermostat with Gasket for Toyota Lexus Scion — 82°C OE Fit, Genuine Replacement

Genuine APSG 90916-A3003 thermostat with gasket is an OE-spec 82°C engine coolant thermostat designed to restore proper temperature regulation in compatible Lexus, Scion, and Toyota engines. This genuine replacement thermostat assembles the valve and matching gasket to control coolant flow as the engine warms, helping the powertrain reach and hold its optimal operating temperature. Built to meet OEM fit and performance standards and produced using materials sourced from Japan with manufacturing in the USA, the part is intended as a direct swap for vehicles that specify the 90916-A3003 or 90916-03129. Installers should follow factory torque settings and service procedures to ensure a leak-free seal and correct operation.

Which vehicles use this 90916-A3003 thermostat?

This thermostat is specified for select Toyota-family models including certain Lexus and Scion variants that require an 82°C (179.6°F) thermostat element. Fitment depends on engine code and model year, so verifying OEM part numbers or your vehicle’s service manual is recommended prior to purchase.

• Direct OE number: 90916-A3003 / 90916-03129 compatibility.
• Commonly used across specific Toyota, Lexus, and Scion engine applications.
• Confirm fitment by VIN or existing thermostat part number.

How does an 82°C thermostat affect engine performance?

An 82°C thermostat valve remains closed until coolant reaches that temperature, enabling the engine to warm to its intended operating range more quickly and then open to regulate temperature. Proper regulation supports consistent combustion efficiency and helps emissions control systems operate as designed without claiming medical or guaranteed outcomes.

• Faster warm-up reduces unnecessary fuel enrichment on cold starts.
• Stable operating temperature protects components from thermal stress.
• Precise opening temperature improves coolant flow control across conditions.

What should I check when replacing the thermostat?

When replacing the thermostat, inspect the gasket mating surfaces, coolant hoses, and housing for corrosion or warping to prevent leaks. Use the specified torque values for the housing bolts, and refill and bleed the cooling system per factory recommendations to avoid air pockets and overheating risks.

• Replace the included gasket to ensure a proper seal.
• Check thermostat housing and bolts for damage or corrosion.
• Bleed the cooling system and verify thermostat opens at operating temperature.

Why choose a genuine APSG-made thermostat?

Genuine OEM-spec thermostats provide predictable fit and function compared with non-specified aftermarket parts. This APSG unit matches factory dimensions and calibrated opening temperature, helping installers save time and reduce potential drivability issues caused by incorrect parts.

• Manufactured to meet or exceed OEM tolerances and materials.
• Comes with the correct gasket to simplify installation.
• Made with components sourced from Japan and assembled in the USA for consistent quality control.

This thermostat is for mechanics, DIY enthusiasts, and fleet maintenance teams who need a direct-fit OE replacement for cooling systems specified to use part 90916-A3003 / 90916-03129. If your vehicle’s maintenance schedule or a failed coolant temperature check points to a thermostat issue, choosing this APSG genuine part streamlines repair with known dimensions and an 82°C opening specification. Always confirm fitment for your exact model and follow vehicle manufacturer service instructions during replacement.

FAQ

Q: Is this thermostat a direct OEM replacement?

A: Yes. APSG 90916-A3003 matches OE specifications and fits models that list 90916-A3003 or 90916-03129.

Q: What temperature does this thermostat open at?

A: This unit is rated to open at 82°C (179.6°F), the factory-specified operating temperature.