Ok..took fan out. It looks great. I see the regulator. How do I know if it's the fan unit or just the regulator?

When I spin the fan with my hands it spins, but doesn't keep going. It doesn't feel like it is stuck...just tight. This normal?

Besides replacing the filters, while I have it out, is there something else I should replace/do? Is it ok to drive the car around with the fan off, (and out of the car)?

Any part numbers? (regulator)

Thanks for all your help!