93 ford explorer over heating. lots of water coming out through exhaust Problem? on 1993 Ford Explorer

The resivore has fluid,the radiator was empty. Started the vehicle and added water. Back pressure blow the water back at it filled and ran it for a few minutes. Then noticed water "pouring" out through exhaust.Turned it off immeditely Now the head gasket on the right side was replaced prior to all this. What else could be wrong?

Asked by for the 1993 Ford Explorer
Head gasket on the left side. Head cracked/warped. Head gasket on rt. side still leaking.