Durango 2WD V8-5.7L Hybrid (2009)
Radiator Cap: Description and Operation
Radiator Cap - Description
RADIATOR PRESSURE CAP
All cooling systems are equipped with a pressure cap on the radiator. This cap releases pressure at some point within a range of 96.5 - 124 kPa (14 - 18
psi). The pressure relief point (in pounds) is engraved on top of the cap (3).
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 (4). This valve opens when system pressure reaches the release range of
96.5 - 124 kPa (14 - 18 psi).
A rubber gasket (2) seals the radiator filler neck. This is done to maintain vacuum during coolant cool-down and to prevent leakage when system is under
pressure.
