Yesterday I was running some errands and would turn the car off while I ran into the various places I had to go... the ac was working fine.

Then, when I left the last spot, I turned on the car and no ac.
No fan.
Nothing.

I also checked the heat, it's not working either.

The back fan works, it's only the front one that's causing me grief.

I have an appointment at the dealership today, but is there anything I can check before I go drive it all the way there?

Specifically, does the ac/heater fan have a fuse or something that I can easily (and cheaply) swap out?