I climbed the tower today and verified that the fan is running on my 5-n-1. You can hear it plainly running in the sunlight.
Ironically, the fan on my VP2 which I couldn't get to work all summer is working today too.
I'm still seeing a temperature generally 3-4 degrees higher than my VP2 or the surrounding mesonet sites that are ~10-15 miles from me to the north, east, and south. As soon as the sun sets, everything is spot on again.
Overall though, I'm still pretty happy with it considering the price and ease of installation.