I have tried researching, but I have had no luck.
Sorry, gotta call you out on this one. I literally searched for "Heater/AC not working" and got 108 threads that speak on the topic.
Anywhoo... JBJT is right, oftentimes it is the switch itself, mechanically. This is a good first place to look. If this looks fine then it's time to open up your console and look at the wiring going to the switch, look for melting or shorts. If the switch looks fine from a wiring perspective then you can look to the blower motor itself, perhaps pull it out clean it and test it by bypassing some voltage to it and see if she spins. All these things you can do without spending a penny.
BTW, since you said the fan does not blow on any setting, even the highest, then it is something other than the resistor pack, as the highest setting does not use the resistor pack it bypasses it through the high speed blower motor relay.