Pressure System
WARNING: This page is about a different car, the 2009 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
This system works on the principal of a closed and deaerated system using thermally generated pressure. The expansion and contraction of the coolant in the pressurized closed system keeps it free of trapped air. It provides:
- A pressurized surge tank volume for expansion and contraction.
- A non-pressurized overflow volume to capture excess coolant expansion and allow for it's return to the pressurized system.
- A pressurized cap on the pressure bottle rather than the radiator. This facilitates deaeration of the system.
- Reserve coolant is included in the pressurized volume to account for minor leaks and evaporation or boiling losses.
- Provides a warning light for low coolant level.