antifreeze

Hey guys quick question, been working on the bike a little trying to figure things out on my own with the owner's manual. I'm not too mechanically inclined but I change my own oil etc. So my coolant reserve (the one located somewhat under the seat) is below the L level. I took off the fairings...

My 06 636 is pushing out antifreeze through the tube that hangs down to the belly fairings. It doesn't overheat, just pushes it out. Not a lot, just a little bit. But I cant figure out why. Anyone have some info that may help me?