Question about flushing AC..please read

[KylePavao]

I ordered this Venturi AC pump from Harbor Freight...to dry the system and suck all the moisture out.

All the AC shops around here charge ridiculous amounts, and the dealer wanted to charge 600 just to convert to R134A!!

Well I didn't want to get raped by the dealers, and I am confident that my compressor is in good shape as it blows somewhat cold air now, and its the old piston type York compressor. Its HUGE!

I have a 10HP air compressor.

My question is, where does all this moisture accumulate after I get a vacuum on the system? Does this go inside the box? Someone have any ideas? I was thinking of simply not drying it, but for this price, I figured I might as well do it the right way (sort of) AC shops don't want to just flush the system for me, they insist on doing the rest of the job (400 dollars +!)