Have read a ton of the threads on AC charging, and watched plenty of video.

There is one question I have not seen addressed in the threads I read:

Once the manifold is hooked up to the vehicle and the vacuum has been set and has proven to hold, do you bother removing the air from the yellow/middle hose that will connect to the Freon can? Clearly there is air in this 5’ of hose that was used to draw down the vacuum, once it is removed from the vacuum pump. So do you just not care about the 5’ of air that gets drawn into the system, or do you somehow bleed it out?

ETCG did not bleed it in his video, nor could I find it mentioned anywhere.

Other than that I’m good to go, I think.

 

Yes, close off the manifolds, attach the can, then quickly open and close the yellow fitting where it attaches at the manifold. You want to let a small amount of refrig out. This will purge the line.