1989 chevy s10 rwd
I was going down the highway going well, way to fast, and then out of nowhere i saw a cloud of smoke behind me and my engine temp shot up. Pulled over and put water in the radiator, and it just pours out onto the ground. Got the car on jacks and found where the giant hole is. There's like an outlet almost right above the starter that has nothing going to it and nothing plugging it anymore. What should go in this hole? And is it supposed to be threaded or not?