911 Carrera (997) F6-3.6L (2006)
^
A hissing sound after connecting the compressed air supply is usual.
6. Connect compressed air supply to Venturi nozzle.
Compressed air supply on Venturi nozzle
7. Open both shut-off valves on the vacuum pressure gauge until the transparent filler hose has completely filled with coolant.
Shut-off valves open
8. Close the left shut-off valve on the vacuum pressure gauge and allow a vacuum to build up in the coolant circuit.
Left-hand shut-off valve closed
9. When there is sufficient vacuum in the cooling system, close right shut-off valve and then disconnect the compressed air supply.