There is indeed a relay that supplies the 12 volts for the fan. Be aware there's four different Mirage models, and not all use the same engines, and some circuitry will be different. This circuit doesn't involve any computers, so diagnosis should be pretty straight-forward.
Pull the blower relay out of its socket, then check for 12 volts on two terminals. One should be there all the time; one only when the ignition switch is in the "run" position. If you don't find two 12-volt feeds to that socket, we'll have to figure out which one is dead, then check the appropriate fuse.
If you do have both 12-volt feeds, stick the relay back in, then feel if it clicks when you turn on the ignition switch. If it does, check for 12 volts on the green wire at the blower motor. If that is there, do a continuity test from the motor's white wire to a good body ground. You should typically find a few ohms of resistance, but not more than perhaps ten ohms, depending on the fan speed switch setting. If that circuit is open, the best suspect is the thermal fuse inside the resistor assembly is burned open, and that is almost always due to tight bearings in the blower motor.
The next suspect would be the speed switch has burned contacts, and that is usually accompanied by two melted terminals, and hardened wires, at the back of the switch.
Let me know what you find up to this point.
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Monday, October 21st, 2019 AT 10:04 PM