A blower motor resistor is an adjustable resistor.
Car air conditioner blower resistor.
The blower motor resistor controls the blower motor s fan speed and ensures that the right amount of power reaches the motor.
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On many vehicles the blower motor resistor which comes as a module that connects to an electrical wire and is mounted near the blower motor is accessible by removing the glove box or checking.
This electrical component is used to control the air conditioning system of a vehicle.
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The most easily noticed issue is a failure to produce any air through your vents even when the air conditioning or heat is turned on.
Every time you fiddle with the fan speed of your car s air conditioning or heating system you change the current that flows through the blower motor resistor on the way to the blower motor.