What's causing this clicking/gurgling sound coming from dash on 2006 Honda Pilot EX-L?

So just this evening, I went out to run some errands and whatnot. It was cold so I turned on the heat and after I did so I began to hear a light rattling sound coming from inside the dash. It's an intermittent rattle, it almost kinda sounds like a Coffee Maker while it's brewing. I played around with the climate control, tried different temperature ranges, messed with the various vent modes, and it even happens when I turn the climate control off. Nothing I do seems to make it stop. All I know is it sounds like it's coming from within the dash itself, everything seems to work fine still, but the noise is pretty annoying. Does anyone maybe have an idea on what's causing this?
Thanks for any help!

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