Description

Function of the Radiator Cap:

1. Sealing: The radiator cap seals the radiator and pressurizes the cooling system. It ensures that the coolant remains contained within the system and prevents leaks.
2. Pressure Regulation: It maintains the pressure within the cooling system at a specific level, typically around 15 psi (pounds per square inch) or as specified by the vehicle manufacturer. This higher pressure raises the boiling point of the coolant, allowing the engine to operate at higher temperatures without boiling over.
3. Coolant Recirculation: When the engine cools down and creates a vacuum in the cooling system, the radiator cap allows coolant from the overflow or expansion tank to be drawn back into the radiator.

Features and Components:

• Pressure Valve: A spring-loaded pressure valve opens to release excess pressure from the cooling system into the overflow tank if it exceeds the designated pressure level.
• Sealing Gasket: A rubber gasket ensures a tight seal between the radiator cap and the radiator neck to prevent coolant leaks.
• Vent Tube: Some radiator caps have a vent tube that allows air to escape as coolant enters the radiator, preventing air bubbles that could hinder cooling efficiency.