A/C - Heater Blower Keeps Running

I have a 98 Sable and the A/C - Heater fan will not shut off. I have un- pluged switches and it still runs. I also understand that there is a blower relay in this car. Can this be the cause. I havw checked to make sure ing. is turned offf and it is. No other problems except for the blower.
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Yes, there is a relay. It's on top left side of radiator fan in a black plastic box with other relays. My friend had the same problem. I just tap it with my hand and its been ok scense ( 2years ago )