The DAYCO DT1312H thermostat is a critical component for maintaining your vehicle's engine health. It precisely controls the flow of coolant through the radiator, ensuring the engine reaches and maintains its ideal operating temperature. Proper thermostat function is vital for fuel efficiency and emissions control. When the engine is cold, the thermostat remains closed, allowing the engine to warm up quickly. Once the optimal temperature is reached, it opens to allow coolant to circulate, preventing the engine from overheating. This DAYCO thermostat is designed for reliable performance and durability. Replacing a faulty thermostat can resolve issues such as engine overheating, poor heating in the cabin, and inconsistent engine temperature readings.