It looks like you were right, It wasn't connected at either end once I chased it.As I said in the other thread, that hose doesn't belong there.
The coolant tank hose comes from beside the radiator cap, at the top of the radiator.
Just grab it and pull it out of there.
The tank is off the bike and there currently isn't a seat so it's easy to get in there.The overflow at the highest part of the tank just has a hose that hangs down toward the ground.
Not sure if my tank has a hose on the overflow or not, have to look.
You'll probably have the gas tank off if you're putting that hose on.... You should check the carb vents and make sure they're connected correctly.