Antifreeze in a vehicle is added primarily to the coolant reservoir, which is a translucent plastic tank located under the hood, usually on the side of the engine bay and marked with a coolant symbol or warning labels
. In some older cars that do not have a separate coolant reservoir, antifreeze is poured directly into the radiator
. Once added, antifreeze circulates through the cooling system, flowing from the reservoir into the engine block and cylinder head via channels called water jackets. It absorbs the heat generated by the engine and then carries it to the radiator, where the heat is dissipated into the air with the help of the radiator fan. This cycle helps regulate the engine temperature, preventing freezing in cold weather and overheating in hot conditions
. In summary, antifreeze goes into the coolant reservoir (or radiator in older vehicles) and then circulates through the engine’s cooling system to maintain optimal operating temperatures and protect engine components from damage caused by extreme temperatures
