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HVAC Heater Blower Motor Resistor for F150, F250, F350 Super Duty 3F2Z-18591-AAThe AC Blower Motor Resistor controls the fan speed for your vehicle's AC and heating system. If you can no longer adjust the air speed with your AC controls, or your AC system no longer blows air, chances are you need a new Blower Motor Resistor. The AC Blower Motor Resistor is located on the lower passenger side dash and is easily accessible by removing a few screws. Installation can be completed in under 20 minutes...

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