94 JGC problem

Two days ago my Jeep was sitting with the engine running and A/C running and it started smoking (overheating I assume) then coolant started spraying out of the bottom under the engine.. When all was said and done the res coolant was empty.. It was filled back up and we have not run the A/c since but we have not let it sit and run too.. The fan is running when you start it... My sister was driving it then so I don't really know if the gage was showing hot or not.. She just turned the jeep off when she saw smoke... What do you think it could be?? Maybe a high pressure leak somewhere.. Would stopleak fix that problem... We are selling it when we fix this problem..

i don't like stop leak, it clogs radiators. The radiator may be plugged or it losing pressure. Test the radiator cap, or see if the radiator is plugged.

yah try a radiator cap or thermostat they could be stuck shut

^^^^ All good stuff, also, might wanna do a quick visual (hoses, engine, etc) just to see if it's not something obvious like an old hose splitting at the clamp or the like.