Fan Won't Stop Running After The Car Is Turned Off

What is your question?

The year is ACTUALLY an '87. Has a 4 cylinder engine that is automatic. Here's the issue; Just got off work and let it warm up to defog the windows. I turned on the heater to full blast on defrost and flipped the radiator fan relay switch that the previous owners installed. Then I let in warm up. Drove home after waiting about 20 minutes after the defrost finally kicked on and I could actually see out my windows. When I got home, I turned off the relay switch and the car... But there was a fan still running somewhere. I tried turning the heater fan switches all off, turning on and off the relay switch, EVEN going so far as to turn on and off the whole car! But nothing is working. Now, I'm not a car knowledgeable person. But I know that's not suppose to happen. From the sounds of it, the fan that is still on is somewhere near the windshield area. Any info or advice would be awesome! Thank you!