I had to take off my lower hose today to change my motor mounts and upon putting it back together and filling it up with coolant, I think I trapped air in the system. I understand that you can take off the purge line and blow into it to clear it of any debris that may be caught. My question is: If I undo the purge line to clear it of debris, will the coolant come rushing out? And if so, will it continue to rush out or will just a bit come out?