okay there is also a 10 amp a/c fuse that is tied into to both switches. Here is the electrical diagram also. You may have a short in the hetar fan switch, these switches are known to go bad. Take the heater control assembly out of the dash and inspect the heater fan switch. If it looks burned replace it. I am certain you will find at least one blown fuse on the system. The 10 amp A/C fuse looks like the only fuse that is common to both circuits. the fuses for this circuit are in relay blockno. 3 in the right kick panel.
Click Here A/C Wiring diagram
the heater control assembly is where the A/C switch and Heater switch are in the center of dash below you radio. Here is the diagram of the dash components.
Click Here Panel