Fitment: For more details,pls check compatibility. What is Thermostat? The thermostat is an important component in its cooling system, it is the valve located in the cooling system of the car. Its main function is to maintain the minimum operating temperature in the car's engine. When the engine is started, the antifreeze and coolant mixture is kept within the engine by a thermostat. It turns on when the specified temperature is reached to keep the engine at the optimum temperature, which can save energy, avoid carbon deposits and bring about a series of problems. Features: .