Why Does My 1993 Ford Explorer’s Heat/ Air Not Blow At All

I can turn the controls on to what used to have worked fine, but then one day I get in to turn on the heater and nothing at all happens. (Same problem with the air) I’m not sure if it is a relay switch, blower motor or what. Can somebody help me, because it sure is a cold drive anywhere I go now. And YES, I do have the vehicle properly started.
The fuse under the dash is fine. I wish it were that simple though!

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