Well my parents came and got me up this morning saying my radiator cooling fan is staying on. It comes on at low speed, idles, revs up to high speed, then goes back down to low speed, then shut off. It's been doing this intermittently and stays on for a minute or two. The car hasn't been driven in over 9 hours, and it's 75 degrees here and wet with no sun. I also started the car and shut it off and it's still doing this. Any idea what's wrong?