What is this part? I think it came from the AC

[chriswf]

2011 Toyota Yaris 4dr hatchback/wagon.

Luckily, I found this part sitting on the undercarriage plastic cover thing under the engine... And didn't lose it on the highway.

Unluckily, I don't know where it goes and I think it's part of the AC (only thing with a threaded bolt sticking out).

If you would, where does this go?
Is there anything else missing?
How much do I torque it?
And how do I tighten it exactly?

I already tried screwing it on with my hand and my little engine starts spinning (lol yaris).

Thanks guys!

http://i97.photobucket.com/albums/l226/hehehstopqq/Yaris/IMG_20150403_080049.jpg
http://i97.photobucket.com/albums/l226/hehehstopqq/Yaris/IMG_20150403_080047.jpg
http://i97.photobucket.com/albums/l226/hehehstopqq/Yaris/IMG_20150403_080052.jpg

[CTScott]

That does look like part of the AC clutch pulley assembly. Follow the belt down to the lowest point and you will see the rest of it.