Technician A states that the cooling system's function is to maintain engine operating temperature. Technician B claims that the water pump controls engine coolant temperature by opening at a set temperature. Who is correct?

The statement made by Technician A is accurate because the primary function of the cooling system is indeed to maintain the engine at its optimal operating temperature. This is essential for efficient engine performance and to prevent overheating. The cooling system achieves this by circulating coolant through the engine, absorbing excess heat, and dissipating it through the radiator.

In contrast, Technician B's assertion about the water pump is not correct. The water pump is responsible for moving the coolant throughout the engine and the cooling system, but it does not control engine coolant temperature by opening at a set temperature. Instead, it operates continuously to ensure proper circulation of coolant based on engine demand, and temperature control is primarily managed by the thermostat, which opens and closes to regulate the flow of coolant based on the engine temperature.

Thus, the focus on Technician A's understanding underscores the importance of the cooling system's role in maintaining optimal engine temperatures.