The Gates 33798S Premium Engine Coolant Thermostat is designed to regulate engine operating temperature by controlling coolant flow to the radiator. This thermostat helps maintain optimal engine performance, fuel efficiency, and emissions control by ensuring the engine reaches and maintains proper operating temperature. Key Features: Premium quality construction for reliable temperature regulation Precision-engineered valve mechanism ensures accurate opening temperature Corrosion-resistant materials withstand harsh coolant environments Rigorous testing ensures consistent performance across temperature ranges Direct-fit design for proper sealing and easy installation Gates thermostats are engineered to OE specifications to help prevent overheating and maintain consistent engine temperature. A properly functioning thermostat is essential for engine longevity, optimal heater performance, and maintaining fuel economy.