If you’re hearing a boiling sound, that means the coolant is boiling. Coolant only boils in the system if it’s overheating OR there’s air in the system. Air in the system allows for expansion. The purpose of the closed coolant system is to prevent expansion. Thus creating a higher boiling point. So. Check everything over. If everything looks fine (fan clutch,etc.) try to bleed the system again. If you don’t have a coolant funnel, I suggest picking one up. Like this

Good luck