I have a 1999 chevy lumina that is overheating

It is not a good idea to drive an over heating car unless it is a position where it is dangerous for you or your car to leave it where it is.It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. I could be a stuck thermostat, a burst hose, electric fans not coming on when they are needed.After driving the car it may a god idea to have a block test (a simple chemical test) to see that the head gasket is not damaged.