This video shows you how to install a new blower motor resistor on your 2001-2005 Ford Explorer Sport Trac. The heat and air conditioning fan is controlled by a separate module, called the blower motor resistor. The nature of this component’s job causes it to heat up frequently, which can lead to failure. If your vents will only blow one speed, this is likely the cause. TRQ has a new resistor module made specifically for your vehicle.