A radiator overflow tank collects the expanding coolant that is heated by the engine and recycles it back into the coolant system once it loses enough heat. The radiator overflow tank works in conjunction with the radiator cap to protect the engine and prevent coolant loss due to overflow, according to HowStuffWorks.Know More
The radiator overflow tank serves as the reservoir for engine coolant that is heated to its boiling point and would otherwise rise up and out of the radiator. Working in conjunction with a thermally activated spring built into the cap, the overflow tank creates a closed cooling system that is much more reliable and practical than previous designs. As the temperature and pressure rise to the coolant's boiling point under pressure, the cap spring activates and allows the heated liquid to flow up and into the overflow tank. The fact that the system is under pressure means that the liquid reaches a higher temperature before boiling, further increasing the effectiveness of the system.
Prior to the advent of effective closed systems, large mechanical fans were used to cool most engines, though they had their drawbacks. Mechanical fans were ideal for driving at low speeds but actually cooled engines too much at high speeds. The solution was the advent of electric fans that turned on and off as the engine temperature rose and fell. Most modern vehicles and mechanical engines employ a combination of an electric fan and a closed cooling system.Learn more about Car Parts & Maintenance
To replace a radiator, remove the coolant, disconnect and remove the old radiator from the engine compartment. Install the new radiator, and fill it with coolant.Full Answer >
To add antifreeze to the radiator reservoir, unscrew the reservoir cap, and pour the coolant in the reservoir tank until it reaches the full line. You need antifreeze, otherwise known as radiator coolant, that is one part coolant and one part water. Do not remove the reservoir cap if the engine is still hot.Full Answer >
A bad radiator cap can cause the coolant to boil over from the reservoir or the engine to overheat. The cap is an integral piece of an engine's cooling system as it retains the coolant´s pressure.Full Answer >
A car's radiator may need to be replaced if it experiences consistent leaks, if there is extensive rusting on the interior and core, or if it cannot process coolant properly. Each scenario can be caused by a lack of consistent maintenance, a faulty part or damage from an accident.Full Answer >