An additive that lowers the freezing point of a liquid
Any of several substances (typically ethylene glycol) mixed with water and added to the car's cooling systems to prevent freezing of the coolant in winter. It also inhibits formation of rust and other deposits that would tend to clog the radiator and coolant passages, thus reducing cooling efficiency.
Antifreeze protects the cooling system against both freezing and boiling over. When used at normal strength (50% antifreeze, 50% water), it can lower the freezing point of the coolant to -34 degrees F. and raise its boiling temperature to 276 degrees F. N