How does the thermostat respond when the engine temperature is too high?

When the engine temperature becomes too high, the thermostat opens the coolant flow. This is crucial for regulating engine temperature. The thermostat is designed to regulate the flow of coolant between the engine and the radiator. When the engine reaches its designated operating temperature, the thermostat will open, allowing coolant to circulate through the engine and absorb excess heat, then directing it to the radiator where it can be cooled down.

This process plays a key part in preventing the engine from overheating. By opening the coolant flow, the thermostat effectively contributes to maintaining optimal temperature levels within the engine, ensuring it runs efficiently and reduces the risk of damage due to overheating.