AC/ Heater blower not working in 2006 Ford Five hundred?

I was having problems with the heater and a/c in the car not turning off unless I turn the car off. And not being able to turn the fan down as well. No biggie I can live with that. Then the other day I went to use my rear defroster and it wouldn't work. Then all of a sudden nothing will blow out. Whether it's A/c or not. I had auto zone check the fuses and they seem to be all working. Is it the blower motor or could it be other things?

Nope

If its not the blower fuse in the panel the likely issue is the blower resistor that's located inside the plenum. Not sure on yours but on most the resistor is accessible from either under the hood or under the dash. The resistor controls the fan speed unless its bad, then it either shows up as a loss of some blower speeds or total loss of blower functions.