I went through both fuseboxes on my truck but never found any blown fuse that might have caused the in-cab fan to quit working.
More to the point, when I started up and headed out on a short drive today, the fan had resumed working.
Maybe by pulling and reinserting whichever fuse controls that circuit, I re-established the circuit. Maybe the passage of time caused some non-electrical problem to abate. I don’t know.
If it happens again, though, I’ll try smacking the fan housing from inside the cab. If it worked on one Ford, it might work on another.