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Blower Motor Resistor
What is a Blower Motor Resistor and where is it Located?
The blower motor resistor, also commonly referred to as an A/C blower motor resistor or a heater blower motor resistor, is an important component to your vehicle’s HVAC (heating, ventilation, air conditioning) system. While a blower motor is what actually forces the hot or cold air through ducting and your car’s interior vents into the cabin, the resistor is what regulates the speed of the blower fan by reducing voltage going to the fan. It allows you to vary the settings of the blower motor so that you can lessen the amount of air that comes into the cabin, as opposed to only being able to have it blasted at you. The blower motor resistor works between a vehicle’s heater and A/C controls and the blower motor and is typically attached under the dash to the heater ducting near the blower motor to help keep it cool while in use.
Basically, there are two types of blower motor resistors – one that uses coil wires and one that uses transistors and a circuit board. The wire-type, which is more common in older cars, uses a different size coil of wire for each fan speed with different resistances, while the transistorized blower motor resistor, found in more modern cars, consists of a printed circuit board with a fully integrated circuit.
Blower Motor Resistor Failure
On most vehicles, the highest blower motor speed setting bypasses the blower motor resistor to give the fan full vehicle voltage (typically between 12 and 14.4 volts). If the blower motor still works on high, but will not work on any other speed, it usually points to a bad blower motor resistor. Since the part gets hot and draws a lot of power from the electrical system, a failed blower resistor may also melt part of the wiring harness when it fails. When a blower motor starts to go bad, it can draw more power than the resistor is rated for and cause it to fail. Lastly, a malfunctioning heater core can leak coolant into the car and damage the blower motor and resistor as well.
Replacing a Bad Blower Motor Resistor
Replacing a bad blower resistor typically requires only a screwdriver or wrench to unbolt it from the HVAC ducts. In the case of a burnt or melted connector, the replacement will be a bit more involved. While soldering and shrink wrapping the new connector is the best method, crimping the new pigtail in place will also suffice.
Need a Blower Motor Resistor Replacement?
Without a properly functioning HVAC blower motor resistor, your car or truck will not be able to blow hot or cold air through the interior vents on lower settings, and will work only on one speed – high. This of course can get pretty annoying rather quickly and you will likely be itching to fix the problem immediately. Luckily, if you are in need of a replacement blower motor resistor for your car, truck, SUV or van, then you have come to the right place. At 1A Auto, we carry a full line of high quality, aftermarket replacement blower motor resistors for many makes and models.
At 1A Auto, shopping for an aftermarket replacement blower motor resistor is easy - we're here to help you select the right part for your vehicle! Call our customer service toll free at 888-844-3393 if you have any questions about our products, warranty, compatibility or to purchase, or you can buy online. Bring your heating and A/C blower system back to good working order and purchase a replacement resistor from 1A Auto today!
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