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A good sign that the blower motor resistor for your heater and air conditioner on your Ford Ranger is going bad is when you can only run the heater or air conditioner when the fan set on "high." The fan will stop running if you set it at a lower setting. Replacing the resistor is not difficult. The hardest part is reaching the resistor so you can replace it. If you own a 1995–2011 Ford Ranger with a bad blower motor resistor and you want to change it by yourself, here is how you can do it.
Remove Wheel Well Liner
The easiest way to reach the resistor is by taking off the wheel well liner. To take off the liner, you've got to remove the passenger side front tire first. You may need a wheel lock key if one of the lug nuts also serves as a lock so the tire won't get stolen. Loosen the lug nuts, jack up the car, and then finish unscrewing the lug nuts and remove the tire. You should set a jack stand under the frame and gently set the pickup truck on top of it to keep you safe while you are working on the resistor.
Remove the mud flap first. There are three 7mm bolts you'll have to remove. One is in the middle of the mud flap on the right-hand side and two are underneath the fender between the doorpost and the wheel well. You will also need to remove a clip on the top left-hand side of the mud flap. Use side cutters to grab underneath the head of the clip and twist it out of the bracket.
There are three 5 1/2 mm screws along the edge of the fender where the side of the liner connects to it. Remove the screws and the four 8mm bolts in the middle and front of the liner. Lastly, remove the clip on the liner where it extends out onto the fender between the doorpost and wheel well. You can now remove the liner from the wheel well.
Replace Resistor
Look up toward the dashboard from inside the engine compartment. You will see the blower and the wires running down from it into a harness connected to a part situated in the backside of the passenger compartment wall. This part is the resistor and the wires will be yellow, reddish-orange, black, and white in color. Remove the harness by lifting up on the clips with a small flat-head screwdriver while pulling the harness off of the resistor. Remove the two screws on the resistor and pull it out of the compartment wall.
Make sure you have a resistor specifically made for your Ford Ranger. Put the resistor into the slot of the broken one and screw it in place. Put the wire harness back on and put everything back together in the opposite order in which you took it apart.
For help, talk to a company such as Duncan Tire & Auto.
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