What component is responsible for controlling coolant flow in a vehicle?

The water pump is the component responsible for controlling coolant flow in a vehicle. It plays a critical role in the engine's cooling system by circulating coolant through the engine block, radiator, and heater core. This circulation helps maintain the optimal operating temperature of the engine, preventing it from overheating and ensuring efficient performance.

The water pump draws coolant from the radiator and pushes it through the engine to absorb excess heat generated during combustion. After the coolant has passed through the engine, it flows back to the radiator where it is cooled before being recirculated. By maintaining an effective flow of coolant, the water pump is essential for the overall thermal management of the vehicle, making it a vital component in ensuring engine longevity and reliability.