What the heck is going on here?

[Spassmacher]

So this is my first time assembling an engine, and I'm now getting to all the hoses and fittings and such. This is a picture of my engine as it was before I pulled it and rebuilt it. I'm trying to hunt down the fitting that is going from the top of my water pump to my thermostat housing. I'm not sure why that thermostat housing has an add-a-piece and goes down to the water pump, I'm pretty ignorant about all the passageways for coolant and fluids and such. So far I haven't been able to track down the fitting or the hose at any parts house. Anybody know what's going on here?



http://www.flickr.com/photos/72744831@N05/7227843970/