A car heater blower motor is the component that blows cold or warm air out of the vents. The motor is controlled through knobs or buttons on the dash or console.
The motor also contains a component called a resistor. The resistor enables the fan to change speeds when a user turns the heat, air-conditioning or fan up and down. If a person turns on their heat or air-conditioning and there is no air blowing out, it can indicate an issue with the heater blower motor. In this instance, the person should consult a mechanic to figure out the exact problem.