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.
 
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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