Diagnosis And Testing: DEAERATION
WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
As air is removed from the cooling system, it gathers in the coolant recovery container. This pressure is released into the atmosphere through the pressure valve located in the radiator pressure cap when pressure reaches 96 - 124 kPa (14 - 18 psi). This air is replaced with coolant from the coolant recovery container.
NOTE:
Deaeration does not occur at engine idle, higher engine speeds are required. Normal driving will deaerate cooling system.
To effectively deaerate the system, multiple thermal cycles of the system may be required.