Brown vacuum line (under dash - driver's side)

[goatmonkey]

In replacing my heater core, I unhooked the vacuum lines. I have the brown line hanging out, unhooked, where the floor vent comes out on the driver's side. Anyone recall where it's supposed to plug back into without me having to tear the dash back out again? It's the hot/cold door controller I'm assuming because the truck only blows hot air. The vent selection controls work.

 

[happy 2011]

well i think year, make and model may help you get the answer your looking for.

 

[goatmonkey]

It's a 2002 SLS Extended Cab 4.3L 4WD.