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The HEPU TM1397 thermostat is designed to maintain your engine's optimal operating temperature. It plays a crucial role in regulating the flow of coolant through the engine and radiator, preventing overheating and ensuring efficient performance. Proper functioning of the thermostat is essential for fuel economy and reducing emissions. A faulty thermostat can lead to either an engine running too cold or too hot, both of which can cause significant damage and decreased efficiency over time. This HEPU thermostat is built to meet or exceed original equipment specifications, providing reliable and consistent performance. It is a direct fit replacement for the original part, ensuring ease of installation.