2007~2015 Weird fan noise without blower on in cold weather

So I have a 2013 cx9 and I started it when it was about 22° out and the air con/heat blower fan was completely off and I was hearing what sounded like a fan buzzing noise? Checked the circulation button, changed the blender settings, and even tried turning rear blower on/off as well as a/c and the noise didn't change at all. Just kept going and after a few minutes got quieter and about 10 minutes later it stopped...Can't figure it out.
2009 CX-9 Touring AWD
Have you checked the fan relay?

The old relays are black, the replacement relays are blue, according to the info in this thread.

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