Vacuum disconnected where does is it go?

[saturnracing2]

whats up guys, i had a quick question and hopefully you guys can answer me soon. i have an open what seems to me a vacuum source that is just right behind the t-body between the firewall and the mustang logo on a 02 4.6 stang....

 

[wmburns]

Pictures would be nice.

If it's a small vacuum line, it's goes inside to control the vacuum operated damper motors.

If it's a larger vacumm line, it's likely the EVAP purge line.