Coolant in a car is poured into the coolant reservoir, also known as the overflow tank. This reservoir is a clear plastic container usually located on the side of the engine bay and is often marked with a coolant symbol or warning labels on the cap. It is connected to the radiator by hoses and serves as the holding area for the coolant
. Once added to the coolant reservoir, the coolant travels through the cooling system: it is pumped by the water pump into the engine block and cylinder head via channels called water jackets. The coolant absorbs heat generated by the engine, preventing overheating. Then it flows to the radiator, where the heat is dissipated into the air, often assisted by a radiator fan. After cooling, the coolant cycles back to the engine to repeat the process
. To add coolant safely, ensure the engine is cool before opening the reservoir cap to avoid injury from hot, pressurized fluid. Fill the reservoir to the marked maximum level but do not overfill. Your vehicle's manual can provide specific guidance on locating the reservoir and the correct coolant type
