You might know that your car’s radiator is responsible for keeping the engine from overheating. What is interesting and often overlooked is the importance of a small and seemingly unimportant component, the radiator cap. A bad radiator cap can render the whole cooling system ineffective and cause costly damage to the precious engine. Therefore, knowing the functions and symptoms of a bad radiator cap is a handy and straightforward DIY maintenance tip that you should pocket to maximize your engine’s performance and lifespan.
The Importance of Radiator Cap
The radiator cap controls this expansion and maintains a constant level of pressure inside the cooling system. The radiator cap also allows the engine coolant to contract and move back to the radiator without letting air enter the cooling system.
The radiator cap acts as a release valve set to open at the maximum pressure point – this is the radiator cap’s rated pressure. This is typically set at a density of 15 psi, otherwise at somewhere between 13 and 16 psi.