Description And Operation

LOW TEMPERATURE 

Courtesy of CHRYSLER GROUP, LLC

• The pressure cap is located on top of the low temperature (LT) pressurized coolant bottle. The cap releases pressure at 5 PSI (34.5 kPa). The pressure relief point 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 5 PSI (34.5 kPa).
• 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.

  Courtesy of CHRYSLER GROUP, LLC

• The vent valve in the cap is normally closed.
• If the O-ring seal (1) is damaged, replace the cap.
• A replacement cap must be the type designed for use on a pressurized coolant bottle.