What happens to the thermostat when the coolant reaches operating temperature?

When the coolant reaches operating temperature, the thermostat opens, allowing hot coolant to flow to the radiator. The primary function of the thermostat is to regulate the engine's temperature by controlling the flow of coolant. Initially, when the engine is cold, the thermostat remains closed to allow the engine to heat up quickly. Once the optimal operating temperature is reached, it opens to circulate coolant through the radiator, where it can be cooled before coming back to the engine. This process helps maintain the engine at an efficient operating temperature and prevents overheating. The thermostat plays a crucial role in the overall cooling system of the vehicle, ensuring that the engine operates at a safe and efficient temperature.