Technician A claims the automotive water pump is a positive displacement-type pump, while Technician B insists a 50/50 mix of antifreeze and water is necessary. Who is accurate?

Technician B is accurate because a 50/50 mix of antifreeze and water is a common recommendation for most automotive cooling systems. This mixture provides effective freeze protection and raises the boiling point of the coolant, which is crucial for maintaining optimal engine temperatures. A balanced ratio helps prevent issues such as corrosion and cavitation inside the engine, ensuring its longevity and efficient operation.

On the other hand, the assertion made by Technician A that the automotive water pump is a positive displacement-type pump is inaccurate for most modern vehicles. Typically, automotive water pumps are centrifugal pumps, which rely on rotational energy to move fluid. Understanding the type of pump in an automotive context is important, as it affects the design and function of the cooling system. Thus, only Technician B's statement aligns with standard industry practices regarding coolant mixtures.