This is a duplex, and there are two furnaces in the basement. We're not having any heat on the 2nd floor, so I went down to check it out. There was water on the floor near the furnace, but I couldn't figure out where it was coming from. The furnace was hot, and the water in the pipe going up was hot, as was the water in the Return line. However, I heard lots of gurgling noises.

I added water to the system to see what would happen, and water began coming out of the big ugly green "Taco Air Scoop". I can see clearly that this is coming from the little canister at the top of the air scoop, and not where the pipes connect to it. Presumably this is only for steam, and is not meant to be pouring water on my floor.

What I find interesting is that the furnace for the first floor does NOT have one of these things.

Having no idea what this part is, I did search around and got a little educated. I just don't understand why the 1st floor furnace does not have one of these, and I also don't know if this part is broken, or if this is just the result of something else being wrong. I'm leaning toward the scoop. The system is ALWAYS under pressure, and this has never leaked before, so what could possibly happen to it? Yes, I think this is it. Please confirm for me :) I'm half asleep.

As you can tell, I'm up late as a result of this (almost 3am here) so hopefully I can get an answer or two by morning so I can work on this problem. Thanks!