Cooling System Flush
The radiator fluid (antifreeze) breaks down over time (+ over 30,000 miles) and will not cool the engine any longer.
When antifreeze breaks down, corrosion takes place in the engine, sludge starts to run in the cooling system clogging the radiator causing engine to overheat.
The most severe damage occurs when temperature drops below 25% F, because aged antifreeze becomes ICE and it might break your engine block, radiator, hoses, etc.