A fan of some sort is running even after the car is turned off? on 2000 Ford Expedition

I heard a louder humming while driving down the road. After I turned the car off, it continued. It has been running for about 20 minutes. I have not idea what it could be and there is no where to take it to be checked out. When I lifted the hood, it was louder. Do you know what it could be?

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1 answer
It sounds like your radiator cooling fan relay is stuck on. Most likely need a new relay, not uncommon.