[cdru]

Your serpentine belt snapped. The belt goes around your AC compressor, your water pump, your power steering pump, alternator, and crankshaft pully. My guess is that it was only holding on by a thread and the sudden lurch by the AC compressor was just enough to snap it.

Without the belt, your alternator doesn't spin, so you don't get a charge voltage. Hence the charging error.

Without the belt, your power steering pump doesn't spin, so you lose the power assist.

Without the belt, the coolant doesn't circulate through the system so it never gets to the radiator. So it just sits there and eventually overheats.

The good news is that it's probably a $15 fix. It's easy enough to do if you have a 3/8" socket wrench to lift up on the tensioner. Hopefully that's all that it is and you don't have something seized up (doubtful).