Which technician is correct regarding the functions of hybrid vehicles having an electric water pump and a hot coolant storage tank?

The correct answer indicates that both technicians are providing accurate information about the functions of hybrid vehicles that feature an electric water pump and a hot coolant storage tank.

Hybrid vehicles utilize electric water pumps to enhance the efficiency of the engine cooling system, especially during periods when the internal combustion engine is not running. The electric water pump can circulate coolant independently of the engine, allowing for better temperature management and enabling quicker heating of the cabin and other components. This is particularly beneficial during start-up phases in cold conditions, where maintaining engine temperature is critical for performance and emissions control.

A hot coolant storage tank plays a crucial role by storing heated coolant that can be used later to heat the vehicle's cabin or assist in engine cooling as needed. This can improve the energy efficiency of the hybrid system by reducing the load on the engine and providing necessary heat without requiring immediate operation of the engine itself.

Having insight from both technicians reinforces the importance of these components in hybrid technology, highlighting their contributions to improved efficiency and performance in modern vehicles. Their combined understandings reflect a comprehensive grasp of the hybrid vehicle's thermal management systems.