The mud-dobbers like to build their mud dwellings on the fan hub, this causes an unbalanced fan, so if your A/C unit vibrates that is likely the cause. My front unit was really bad, couldn't run it, the back (L.R.) unit was a small vibration. I even had a Mud-dauber nest on the inside up in the fan, (inside the RV) this one was on the fan shroud.
The large fiber nest was up under the cover, as I removed it. If they were in it, I would have got stung bad, so be careful.
I think they were K.C. wasps.
Good tip is to spray around the cover before you remove it with wasp spray, if they are in it, they will come out, but probably not attack you.
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