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Description And Operation
 Courtesy of CHRYSLER GROUP, LLC
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- The pressure cap is located on top of the pressurized coolant bottle. The cap releases pressure at 1.4 bar (20.3 psi). The pressure relief point (in bar) is noted 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 1.4 bar (20.3 psi).
- An O-ring gasket seals the pressurized coolant bottle. This is done to maintain vacuum during coolant cool-down and to prevent leakage when system is under pressure.