Heater / AC In-Dash Control Panel Vaccuum (98 Regal)

On the in-dash Heater Control Panel on my 98 Regal there are six numbered and color-coded vacuum lines attached: (1=Yellow, 2=Red, 3 = Brown, 4= Orange, 5 = Blue, and 6 = Purple).

This panel is receiving no vacuum and I am trying to figure out two things: which one is the source of the vacuum and where does it terminate on the other end? Is there somewhere I can get a schematic of this air flow vacuum system?

Thanks in advance for any assistance you can provide.