AC fan will not turn on

You are losing power somewhere I would start with the 40 amp fusible links, also check the fans by see if you can turn them by hand.

Here is a guide to help you see where you are losing it and the wiring diagrams for the fans so you can see how the system works and the fuse panel locations and identifications.

Check the relays as well.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what you find.

Cheers