Blower motor not working

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.

Hello,

Here is a guide to help you check for power and a more complete blower system wiring diagram so you can see how the system works:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (below). Please let us know what happens.

Please list the specific places you're finding 12 volts so we don't confuse each other. Did you find it on two terminals in the relay socket?

The radiator fan is on a separate circuit, so that won't make a good clue this time.

If you're missing 12 volts on the green wire to the fan motor, the relay has to have burned contacts, or it's not turning on. Did you feel if it clicks when you turn on the ignition switch? Regardless of the cause, if there's no 12 volts on that green wire, you won't have any voltage further down the line at the resistor assembly or the switch. That would suggest those parts are not good suspects. We need to figure out why there's no 12 volts on the green wire.

CARADIODOC is one of our best! Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.

Hi steelers_union,

Thank you for the donation.

Give the fan blower motor housing below the glove box some banging with your hand and if the fan comes on, the fan motor is failing and would have to be replaced.

Hi deke4,

Check if you have sufficient coolant in system.

Check the control cable adjustment.

Work on the crankshaft should not affect the heater system.

Blower fan is located behind passenger side dash.

Is heater blowing through other selections besides defrost? Check for vacuum leaks on heater / a/c system behind dash.