If the low and medium speeds of your fan are not working and only the high speed is working, then it is probably the resistor fan control module. This unit will have to be replaced. It is generally located underneath the dashboard on the passenger side. Locate the blower motor and trace back the two power leads from the blower motor. They will terminate at the resistor module. The resistor module is a series of resistors that controls the amount of current flowing into the fan motor. On low speed settings, the current flows though all the resistors and as you increase the fan speed, resistors are switched out until eventually at the highest setting the complete resistor network is switched out. That is why you end up with only high blower fan speeds when the resistor module becomes defective.
Check blower motor fuse Check to see if compressor is working
The blower in my 2001 Honda Civic did not stop working.
2004 ford expedition front blower not working
Thermostat possibly stuck open or heater control valve broken. Now if you mean the blower motor has stopped working, check the fuse, blower motor itself, or the blower motor resistor pack.
The blower motor can be checked with an ohm meter to test continuity. Also, use a volt meter and check to insure that the resister and motor are actually getting power. a broken wire or bad plug connection will cause loss of power.
Blown fuse, defective blower motor resistor pack, defective blower motor, or loose or disconnected wiring.
Check to see if you are getting power to the blower motor - if so motor is defective if not problem in circuitry to blower motor
Check the blower resister and then check the blower motor switch..
The blower motor resistor assembly is located under dash on passenger side.
Check to see if you are getting power to blower motor - if so replace blower motor If not check fuse, switch, resistor pack.
Same thing happened to me this morning. Hopefully it's the blower fuse. Will check it out later today.
The blower motor, or blower motor relay is probably out.