If your relay and fuse are okay, and you blower will not run at any switch speed, there could be an issue with the brushes and commutator of the blower motor. Once I had a small leaf go in between one brush and the commutator and it kept my blower from running. once I removed it, it ran fine. My blower was located on the passenger side under the glovebox. It required removal of about a dozen fasteners and it took about an hour to disassemble, diagnose and return to working order.
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