Electrical fan still running, why?

What is your question?

Just pulled into the driveway and turned off the ignition after being on the road for about 1/2 hour. After getting out of the vehicle I heard some type of fan, still in operation. I immediately turned the vehicle on again and then shut it down within a minute or two. The fan was no longer running. What could it possibly be? NEVER happened before. Vehicle has 54K and was recently in for a Hyundai warranty for an electrical issue. Thanking you in advance........ Joe