I'm seriously considering adding the 3rd radiator kit to my BS. The write-up on Schnell Auto is very detailed and helpful. However, they recommend using a vacuum system for replacing the coolant to eliminate the air pockets that get formed. Not having access to the device they use I was wondering what others might recommend? MY other option is to have Porsche do the coolant flush - presumably they all do some form of vacuum replacement to prevent air gaps. Anyone familiar with the Porsche coolant flush procedure? Thanks in advance.