Does a 1997 Mercury mountaineer need antifreeze to cool the engine?

Yes , it came from the factory with a 50 / 50 mix of antifreeze and distilled

water in the cooling system . The antifreeze in the mixture provides freeze ,

boiling , and corrosion protection ( the corrosion protection does " wear out " )

The other parts in the engine cooling system , such as the water pump ,

engine thermostat , engine cooling fan , hoses etcetera also need to be

working properly