99 Mercury Tracer Console Noise

I have a strange noise coming from the console area where the radio/heater controls are. With just the ACC on and the car not running it is a
ratcheting/grinding noise at the same interval, aproximately every 3 seconds repeating all the time the key is on. It also does it when the car is running. Everything is working properly but for how long is anyones guess. Any ideas about this or has it happened to anyone else? Thank you, Jim
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