The switch is out or you have crossed wires-it's still getting current. Use a test light with switch off on hot wire between switch & motor. If there is current, your switch is bad.
If you are referring to the blower motor speed control, and you only have one speed, then the blower motor resistor pack is defective and must be replaced.
Common causes, blower motor resistor, blower motor, wiring or controls
I would look into the blower motor resistor module
A malfunctioning blower motor resistor will cause the blower motor not to work. When the resistor is bad the blower motors will not turn on.
Replace the paulse board that's attached to the wiper motor.
Defective blower motor Resistor Pack. Replace it.
When you beat the blower motor, you are probably shaking the blower resister. The resister is what controls the blower speeds and is probably bad or loose.
blower motor actuator needs to be replaced.
it is cool
Bad fan motor? Check to see if you are getting power to it Bad Switch? Bad fan relay?
How do I install a turn signal switch for a Chevy 2000 Impala? WHere is the old part that I need to replace?
What can happen when a blower motor resistor goes bad is that the motor will run and then suddenly stop running on a regular basis. Sometimes the blower fan will not turn on and cause the motor to overheat.