If I'm reading that correctly the heater core hose port broke off. I'd wanna plug the heat core, both ports somehow to keep it from leaking into the vehicle. Loop the heater core hoses to each other and you'll be okay to drive it.
I have no hints on replacing the heater core, it can be quite time consuming on modern vehicles. AllData says the Expedition heater core is an 8hr job, so it'd take me 16hrs probably. It took 30 minutes on my 78 Bronco.