Clicking sound when AC is on

What is your question?

The clicking sound happens when I turn the car on, sometimes I even hear it when the car isn't running. It lasts maybe 30 seconds and sounds like it's coming from the glove box. I recently had my cabin air filter replaced. It happens when the fan is blowing for the AC, haven't used the heat lately so it may happen with that running too. Any idea what this is, how to fix it or how much it will cost?