When you find out let me know I have same problem replaced blower fan and resisitor did not work. I have a blazer zr2 2002
Common causes, blower motor resistor, blower motor, wiring or controls
try a blower motor resistor
Could be, a bad blower motor, a blown fuse, a bad resistor, a bad switch, damaged wiring,
Either the switch or resister network has failed and needs to be replaced.
Could be,Blown fuse,Bad blower motor,Bad blower motor switch,Bad blower motor speed resistor,
If it's a fan speed issue check the blower motor resistor & the blower motor. Check the plugs at the resistor and blower motor for burn marks also.
Should under dash on firwall near blower motor.
First check your fuse 25 amp #12 on the drivers side fuse compartment then if it only works on high speed you have a bad resistor board (speed control ) this regulates the speed but is bypassed on HIGH.... next pry back the plastic cover and give the motor a rap with a screwdriver or hammer with the key on and blower switch on of course. if it starts you have a bad blower motor.. there are two types 1 wire and 2 wire so get the right one and good luck getting that plastic cover off...
where is resistor pack on 2010 impala lt 6 cylinder 3.5 motor
Classic symptoms of a burned out blower motor speed resistor. Examine the wire harness and all connections for damage. The year, make and model info would help for more detailed info.
Blower motor control relay under dash behind blower motor is bad or has water in it from cabin filter port.
your ac fan motor is probably bad (the motor has different speeds, one speed maybe bad), or swicth is bad (alot cheaper to fix) The blower high relay on the top of the evaporator under the hood by the firewall passenger side is not working, may need to replace it.