2003 Pontiac Grand Prix

I having trouble with with my car. The cars turns on fine and drive very well. The problem that I am having is that during the summer after I drive the car for a while, and then after a shut hte engine off, and try to restart the car, it won't start? I am not sure why does it do that? I ahve to wait a least an hour or so to be able to re-start the engine(when it cools off). I am not sure if the cooling fans work or has anything to do with the issue that I am having. I hope that someone be able to guide me and see if they can help me with the issue. Otherthatn that, everything else is great with the car.