You need to explain again with more detail.
blower motor resistor is bad
Replace the high speed relay.
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.
Blower speed resister is burned out.
Defective blower motor, blower motor resistor pack, or blower motor speed control switch.
More than likely the blower motor speed resistor burned out.
The blower motor is tired. It will eventually blow a fuse and/or burn out the blower motor speed resistor. Time to replace the blower motor. Also check connections for high resistance damage (melted connections).
check the blower fuse if the fuse is good the blower motor is bad or else you have short
If you are saying the blower motor will not work, then check the fuse. If the fuse is not blown, then it is possibly a defective Blower Motor Resistor Pack, blower motor, or blower motor speed control switch, in that order.If you are saying the blower motor will not work, then check the fuse. If the fuse is not blown, then it is possibly a defective Blower Motor Resistor Pack, blower motor, or blower motor speed control switch, in that order.
It gives you all the blower motor speeds except high. all blower motors are 12 volt, so on full speed they turn fast and blow a lot of air, to make the fan turn slower [and blow less air] they route the power through a resister, it drops the voltage to the motor so turns slower, on a 4 speed motor there will be 3 resisters.
The blower motor speed resister is probably burned out.
the blower resistor is bypassed on high. a direct path to ground. if high is the only operational speed the resistor is bad.