Your 1993 Chevy Lumina started smoking from under hood no temp lights on no oil light did get a low coolant light when you turned car off and restarted What could be the problem?

When coolant leaks on a hot engine it produces quite a bit of steam, and it looks like smoke. Make sure you aren't leaking coolant somewhere and if you are, take care of the problem before the engine is destroyed. It's usually a radiator hose or heater hose, but whatever you do, take care of the problem before driving it again.