Utica MGB150HID ZERO pressure

Okay, So this is my first cold season in my new house. I took a wall out and removed a baseboard register and replaced it with a straight pipe in the basement. So I'm certain there was air in the system. Yesterday while in the lower level (quad level house) i heard the registers gurgling. A google search turned up a video on how to bleed the system. I put a short hose where the yellow arrow points into a bucket with a little water so i could see the air coming out, and closed the valve leading back into the boiler red arrow Image: http://i441.photobucket.com/albums/qq138/mattb-84/IMG_20141013_213312arrows974.jpg the result was about two gallons of water and some bubbles. Image: http://i441.photobucket.com/albums/qq138/mattb-84/IMG_20141013_213248531.jpg