The blower motor resistor controls the blower motor s fan speed and ensures that the right amount of power reaches the motor.
													
																	Car air conditioner blower resistor. 
								
	
		
	
																	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. 
																	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. 
																	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. 
																	What are the symptoms of a bad blower motor resistor. 
															
													
								
	
		
	
																	4 6 out of 5 stars598. 
																	There are many warning signs to be on the lookout for which can indicate that your car or truck needs a new blower motor resistor. 
																	This electrical component is used to control the air conditioning system of a vehicle. 
																	A blower motor resistor is an adjustable resistor.