19045-P08-013 RADIATOR CAP 1.1




Cooling System Inspections: Many radiator caps feature a built-in pressure-relief lever or tab. This enables mechanics or vehicle owners to safely release any remaining pressure in the system before removing the cap. It allows for routine inspections, coolant refills, or maintenance without the risk of scalding hot coolant spraying out.Sealing

Function: A properly functioning radiator cap creates a tight seal between the radiator fill neck and the cap itself. This seal prevents coolant leaks and keeps the cooling system pressurized, maximizing its efficiency and preventing overheating.


The radiator cap is an essential component of a vehicle’s cooling system. It is located on the radiator’s fill neck and has several important functions:

Pressure Regulation: One of the primary purposes of the radiator cap is to regulate the pressure within the cooling system. As the engine heats up, the coolant expands and increases the pressure. The radiator cap is designed with a pressure valve that allows excess pressure to escape, typically at around 15 psi (pounds per square inch). This prevents over-pressurization and potential damage to the cooling system.

Coolant Recirculation: The radiator cap also serves as a gateway for coolant circulation. When the engine is cold, the radiator cap remains closed, allowing the coolant to circulate within the engine block and radiator. As the coolant heats up and expands, it pushes open the pressure valve in the cap. This opening allows the coolant to flow into the overflow or expansion tank, relieving excess pressure and maintaining the proper coolant level.

Prevention of Air Intake: The radiator cap is equipped with a secondary valve or seal that prevents air from entering the cooling system when the engine cools down. This helps maintain a vacuum within the system, preventing coolant loss due to evaporation and ensuring consistent cooling performance.

It’s important to note that each vehicle may have specific requirements regarding the radiator cap, such as pressure rating and design. It is recommended to consult the vehicle’s manual or a trusted mechanic for guidance on selecting and maintaining the appropriate radiator cap for your car.


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