The Blower Motor Resistor controls the fan speed in your AC and heating system. If you can no longer adjust the air speed with your AC switch control or your AC and heater no longer blows 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 and you can save hundreds by doing this repair yourself. If you are unsure, remove your factory blower resistor and ensure it looks like the one pictured. Fits the following vehicles: 2009-2017 Expedition 2009-2014 F-150 2009-2017 Navigator Replaces part numbers: BL3Z-19E624-A, YH-1829, BL3Z19E624A This is a compatible replacement part manufactured by AA Ignition. This blower motor resistor is NOT a genuine OEM part. Vehicle makes and their associated vehicle models are registered trademarks of their respective owners. These trademarks and part numbers are used in this listing only to identify the vehicles this blower motor resistor fits. AA Ignition is a registered trade mark of GWA Auto Parts Inc.