in ordeer to remove the radiator hose 9any rediator hose) you'll want to be careful not to rock it such that it applies a sideways force on the neck of the tube.

Instead, try to twist it about the tube first, before sliding it off of it. This will break free any rust, dirt, deteriorated rubber or whatever that is fusing the hose to the pipe stub.

I like to apply a thin coating of anti-sieze during re-fitting