Cap, Radiator: Description
| 1 - FILLER NECK SEAL |
| 2 - VACUUM VENT VALVE |
| 3 - PRESSURE RATING |
| 4 - PRESSURE VALVE |
All cooling systems are equipped with a pressure cap. For all engines, the pressure cap is located on top of the radiator outlet tank. The cap releases pressure at some point within a range of 97 to 124 kPa (14 to 18 psi). The pressure relief point (in pounds) is engraved on top of the cap
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 of 97 to 124 kPa (14 to 18 psi).
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.