CTS RWD V8-6.2L SC (2009)
12. Continue to draw vacuum until the needle stops rising. This should be 610-660 mm Hg (24-26 in Hg).
Cooling hoses may start to collapse. This is normal due to vacuum draw.
13. To aid in the fill process, position the graduated reservoir above the coolant fill port.
14. Slowly open the valve on the vacuum gage assembly. When the coolant reaches the top of the fill hose, close the valve. This will eliminate air from
the fill hose.
15. Close the valve on the venturi assembly.
16. If there is a suspected leak in the cooling system, allow the system to stabilize under vacuum and monitor for vacuum loss.
If vacuum loss is observed, refer to Loss of Coolant (See: Engine, Cooling and Exhaust/Cooling System/Testing and Inspection/Symptom
Related Diagnostic Procedures/Loss of Coolant).
17. Open the valve on the vacuum gage assembly. The vacuum gage will drop as coolant is drawn into the system.
