I think under the hood in a fuse box.I would check the blower motor resistors connection afterwards.Turn ignition and fan switches on then wiggle the pigtail going to the resistor.Its located in the heat duct on the passenger side near the floor.These resistors are known for getting hot and melting the pigtail causing it to loose connection.
I have had this issue, first off it the resistor pack is bad high would still work. The motor is in the middle of the firewall ,you can see if you are getting voltage to this point, if you are the motor is bad (usually the brushes wear out) if no voltage and the fuse is good then you will have to go to the switch itself. I'm pretty sure this deos not run through relays.
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