[Dmitry at Pelican Parts]

Originally Posted by porschedavid

When you use an air lift vacuum tool is there an over flow pipe in the coolant reservoir that you have to block to stop it building up pressure

Here is a link to a helpful guide which goes over the bleeding.

https://www.pelicanparts.com/techarticles/Porsche-996-997-Carrera/29-WATER-Coolant_Flush/29-WATER-Coolant_Flush.htm