I can’t seem to figure it out! is there a chance this was used for A/C?
— nevermind!
Where does it lead from? If it comes from the exh side of the engine, out of a hard pipe from the block, then it goes to your valve cover. It is a breather for the block.
If it comes across the back of the engine from the int side of the engine, then it likely is the heater hose, and has to go into one of two pipes leading through the firewall on the passanger side (USDM) of the car. The metal fitting in the middle leads me to believe it is the heater hose, and it needs to run back behind the engine, and into the top (white colored) pipe sticking out of the firewall.
This is the first thing mentioned on SR swaps online, is that the heater hose is normally facing where yours is now, and needs to be re-routed to our passanger side.
ok cool, thats another thing i was thinking