I don't know if anyone has posted a good schematic of the system (besides the typical vacuum hose chart underhood)
Maybe there's a good layout in the bentley... I still don't have one. Sorry in advance if "This has been covered already!!!"
I had fun making it, might as well share the wealth.
But this should help some of you who either don't really understand the system, or want a better more concise view of the associated parts. The car I used to figure all of this out on is a 2001 New Beetle 1.8T. enjoy!
And if you would like to download a very nice PDF version, here it is: