This little guy basically controls the speed of your blower fan. It doesn’t make the fan blow, it just regulates how much power gets to it. It has several different resistance levels built in. So when you select different fan speeds – low, medium, high – the resistor is what’s changing the amount of electricity flowing to the motor to give you those speeds. It takes the full voltage coming from the system and ‘steps it down’ to different levels. It’s part of the whole heating and air conditioning system, specifically dealing with the air movement. It sits inline between the blower motor and the control panel on your dash. When you turn the fan speed knob or press the buttons, it’s sending a signal through this resistor which then dictates how fast the fan spins. It’s usually mounted to the blower motor housing or nearby. Without a working resistor, you'll probably only have one fan speed – usually high. Or, it might not work at all. It's one of those things you'll notice if it goes bad because your heat or AC won’t work properly. It acts like a shield, protecting the blower motor from getting too much power at once, so it doesn’t burn out. They can overheat and fail over time, especially with a lot of use. We carry a lot of these at Fixparts Online, and getting a new one is a pretty straightforward fix for a lot of HVAC issues. Dedicated to your needs: Resistor (MPN 64116912633) comes with a 12-month warranty!

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