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Antifreeze is an additive that lowers the freezing point of water. Water is pumped around the engine through the radiator, the air moving through the radiator cools the water and hence stops the engine from overheating. When the outside temperature drops to below 0°C the water can freeze, expands and damages the engine. The term engine coolant is widely used in the automotive industry, in this context corrosion inhibitors are added to help protect vehicles' radiators, which often contain a range of electrochemically incompatible metals. Water pump seal lubricant is also added. A wide temperature range can be tolerated by the engine coolant, such as −37 °C to 129 °C for a 50% mix with water. Different colours of coolant indicate how long the freezing-point depression additives operate.