Cap, Radiator: Description
The engine cooling system is equipped with a pressure cap on the pressurized coolant bottle. This cap releases pressure at some point within a range indicated on the cap. The pressure relief point is engraved on top of the cap (1).
The cooling system will operate at pressures slightly above atmospheric pressure. This results in a higher coolant boiling point allowing increased radiator cooling capacity. The cap contains a spring-loaded pressure relief valve. This valve opens when system pressure reaches the release range indicated on the cap.
A rubber gasket seals the radiator filler neck. This is done to maintain vacuum during coolant cool-down and to prevent leakage when system is under pressure.