Air won't blow out of vents 1989 s10
Bad blower motor or blower motor switch or a blown fuse. I would check the fuse first.
Now for a real answer, Have you checked the fuse for the blower motor? It could also be the fan speed switch.
Looking for a Used S-10 in your area?
CarGurus has 1,393 nationwide S-10 listings starting at $1,995.
Search Chevrolet S-10 Questions
Chevrolet S-10 Experts