Technician A says a water pump controls the flow of coolant through an engine. Technician B says an oil filter controls the flow of oil through an engine. Who is right?

The correct answer is that neither technician is right. A water pump does indeed play a crucial role in the cooling system of an engine, as it circulates coolant to absorb heat from the engine and dissipate it through the radiator. However, while Technician A describes the water pump's function accurately, their statement about controlling the flow of coolant could be misleading since the flow is regulated by other components as well.

On the other hand, Technician B's statement about an oil filter controlling the flow of oil through an engine is incorrect because the primary purpose of an oil filter is to remove contaminants from the oil circulating in the engine. Although it may have some impact on the oil flow due to pressure differentials, it does not actively control the flow in the same manner as a pump would. The oil pump, not the filter, is responsible for maintaining oil flow throughout the engine.

Thus, both technicians' assertions contain inaccuracies regarding the specific roles of these components in their respective systems.