Help me identify what this is and where it goes
 

I have a few issues that I'm still resolving. The first is I think I'm supposed to have a hose connected on the nipple on the bottom of my coolant reservoir. can anyone confirm what needs to plug in here?

http://i522.photobucket.com/albums/w...s/DSCN0669.jpg

Secondly, this plug goes to something...but I don't know what. Can you tell me what?

http://i522.photobucket.com/albums/w...s/DSCN0670.jpg

Lastly, I just put a bunch of stuff back together and have this loose line (appears to be a vacuum line). Can you tell me where it plugs into?

http://i522.photobucket.com/albums/w...s/DSCN0671.jpg

Thanks for your help!

In regards to your first picture, that is an overflow port. If coolant boils over / expands too much it'll simply dump out of there and get burnt up by the surrounding components or hit the ground.

As for the other pictures, it's hard to tell.

Thanks. I put some coolant in and it started to drip out a little - the first time I've seen that. Hopefully it's all good.

The second pic is to the lower right (from the front of the car) of the airbox. The wires go around the front of the car and connect to the harness on the drivers side.