Final answer:
Technician A is correct in suggesting to confirm a known leak with a pressure test before repair. Technician B's claim about the time to drain coolant is not universally applicable, as it can vary widely based on specific vehicle conditions.
Step-by-step explanation:
The question pertains to the procedure for diagnosing a coolant system in an automobile and involves reading various scenarios to apply knowledge in engineering principles, specifically within the mechanical and automotive fields. Technician A says to confirm a known leak by doing a pressure test prior to starting the repair. This is generally correct because performing a pressure test can help verify the source and severity of the leak, which is critical information before any repair is initiated. Technician B's statement about the time it takes to drain coolant is more variable and depends on the specific vehicle and conditions, so it cannot be universally deemed as correct. In practice, the time to drain coolant can vary widely based on factors like the size of the drain valve, the viscosity of the fluid, and the design of the cooling system.