My fan for heater is not working and it doesn't work for ac either zero blower fan on any speed I checked fuse under the dash what else should I check to fix this

1996 ford f250

 

I recall some problems where the wiring behind the blower switch overheated and corroded so bad that there was no contact at the blower switch. Had to replace the switch and wiring plug, dealer had kit for this. The real problem was excessive current draw from the blower motor that caused the wiring and switch to fail. Blower motor was the root cause and replacement was the fix.