The engine coolant thermostat is a component that controls the flow of coolant through the engine. Its main function is to regulate the engine operating temperature and prevent it from overheating.
It's important to note that a faulty thermostat can cause the engine to overheat or not reach the proper operating temperature, which can lead to engine damage. It's recommended to have the thermostat replaced if you notice any signs of overheating, such as a high temperature gauge, steam from under the hood, or a warning light on the dashboard.
It's also important to use the correct type of thermostat for your vehicle as specified in the vehicle's manual or by the thermostat manufacturer.