I recently had a problem when I drove the car 2003 malibuand came home and parked it all the antifreeze would come poring out, brought to mechanic and he changed the thermostat. Brought the car home and it did it again , brought back to the mechanic and said the system need to be bled AND ANITI FREEZE CHANGED. Just drove it again today and it leaked but not as much when I opened the hood I noticed that the overflow bottle has a hose attached that is attached to nothing and that seems were today's leak came from is that hose supposed to be just loose and not attached to anything.. Need advise please....