A coolant/antifreeze flush removes scale and contamination from inside the radiator, engine, and coolant hoses and maintains the proper coolant pH. Coolant pH is continually dropping and the lower the pH the more acidic and corrosive the coolant becomes. Coolant should be changed every two years or twenty four thousand miles on most vehicles today. Failure to flush coolant can lead to water pump failure, radiator failure, shortened hose life, failed head gaskets, and many other costly problems.coolant