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Check to see if blower is working by running 12v to it. If that works check if your heat/ac controls are working by looking at the area where the flaps are and turning the knobs/buttons. You should hear the flaps move or see the pins of the flaps turn. See if your heater core is working. Should be hot as coolant from engine passes through it.
Sounds like you have a bad connection at the blower motor plug. Have you checked under the glove box where the blower motor is? Usually has a big plug with 2 heavy gauge wires. that might be melted or getting a bad connection. Try holding the plug to one side or wiggle it to see if turns off blower. If not, check your resistor that controls your fan speed, located near the fan on your a/c ducts. Usually has a plug with 4 0r 5 wires held up by 2 screws. The wires are heavy gauge as well
I've had mice in my Nissan PU and actually caught one in a trap set on the floorboard; so I know they can get inside. They also knocked some of the fiberglass insulation into the blower motor so it vibrated as it was no longer balanced. You could have a dead one in your blower. Mine was easily accessible from under the passenger side under the dash. Three screws and the motor dropped so I could clean out the fiberglass.
Would this be caused by the blower motor resister or the
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