The blower motor resistor is a small rectangular module that sits next to the blower motor in your Ranger. When you turn the dial on the dashboard to select a circulation speed the signal first goes to the resistor, which then signals the blower motor. A defective blower motor resistor may prevent the unit from working completely. However, when it fails, it commonly will only allow air to circulate on one setting. You can replace the resistor in the 1994 Ford Ranger in 25 minutes or less with a few common tools.
Raise and support the hood on your Ford Ranger. Locate the battery and remove the negative (-) cable from it with a socket wrench. Move the cable away from the battery and make sure that its terminal does not rest on other metals inside the engine compartment.
Locate the blower motor at the back of your Ranger’s engine compartment. It mounts on the passenger’s side of the firewall. Follow the wiring harness connected to the blower motor for about 6 inches. The rectangle at the opposite end of the wiring harness is the blower motor resistor.
Unplug the wiring harness from the resistor. Note the position of the blower motor resistor. Remove the two Phillips screws from the resistor with your screwdriver. Set the screws on the lip of the fender or place them in a pocket.
Pull the resistor out from its mounting position and discard it. Install the new resistor back in position. Reinstall and tighten both screws with your Phillips screwdriver to hold the resistor in place.
Plug the resistors wiring harness back in. Connect the negative cable back to your Ranger’s battery and secure it in place with your socket wrench. Shut the hood and test the new resistor by operating the heat or air conditioning at various speed settings.
