Antifreeze is used to lower a freezing point, whereas coolant is used to remove heat. Antifreeze is chiefly used to lower the freezing point in the radiator of a motor vehicle. Coolant is a substance typically used to reduce the temperature of the liquid in an automobile cooling system.
Antifreeze originates from 1910 to 1915, and it is a liquid typically based on ethylene glycol. It is added to the cooling medium of a radiator in order to lower the freezing point. Coolant originates from 1925 to 1930, and it is usually a liquid or a gas. It reduces the temperature of a system by conducting away the heat.