When flushing cooler lines, pay attention to the maximum _____ recommended by the manufacturer.

• A. Volume
• B. Temperature
• C. Pressure
• D. Torque

Answer: (C)

Pressure is the critical limit to watch when flushing cooler lines because the system is designed to withstand only a certain level of force pushing the coolant through. Using a pump can generate pressures that exceed what hoses, clamps, fittings, and the radiator cores can safely handle. If you push above the manufacturer’s maximum pressure, components can rupture, seals can fail, and the cooling path can be damaged, defeating the purpose of the flush. Volume isn’t a safety limit in this context, and while temperature and torque matter in other aspects of work, they don’t set the immediate safety cap for flushing; staying under the recommended maximum pressure protects the system and ensures an effective flush.