[Reference Number] Manufacturer Part Number: 1511077 12651113 12638836 Function: The automotive coolant thermostat is crucial for regulating engine temperature, preventing overheating, improving fuel efficiency, reducing wear on engine components, ensuring proper heater , and providing vital coolant temperature information to the engine control unit. Material: This automotive coolant thermostat boasts reliability and durability. Our engine coolant thermostat housing assembly is made of metal. Professional manufacturing processes ensure stable performance and long-lasting use. Regulating Coolant Circulation: The coolant thermostat acts as the core temperature-control valve, automatically switching between small and large circulation loops based on coolant temperature. During a cold start, it closes the passage to the radiator, confining coolant circulation to the engine's internal "small loop" to help the engine rapidly reach its ideal operating range of 85–95°C. Maintaining Constant Operating Temperature:Once the target temperature is reached, the valve gradually opens to direct coolant into the radiator for "large loop" cooling. This prevents overheating and stabilizes the operating temperature within the optimal range, thereby boosting combustion efficiency by 12%–15%.