That hose connects below the throttle body and runs into a loomed harness, from there it moves up to the passenger side of the car into the box next to the battery. From there it exits and runs under the battery and into the grommet in the firewall, then its off to the door controller under and behind the glovebox.

If the recirculation door button does not work on the car check under the battery as it is common that some for the battery acid to eat it away or for the plastic to dry rot under there.