Car Fix DIY Videos

Video tutorial on how to replace the blower motor resistor on a Ford Ranger. This is a fairly common issue amongst Rangers, Explorers, and most likely the Mazda B series trucks as well. The main symptom of a failing blower motor resistor is that your fan speed will only work on the high setting. If your fan doesn’t work at all, then there is most likely a blown fuse, issue with the blower motor, hvac panel problem, or a fault in the wiring. This particular vehicle I am working with here today is a 1998 Ford Ranger, so there maybe some variations between the years and models.

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Tools/Supplies Needed:
-8mm 3/8” drive socket
-3” 3/8” drive extension
-3/8” drive ratchet
-blower motor resistor
-dielectric grease
-interlocking pliers

Procedure:
-start by opening the hood of your vehicle and then locate the blower motor resistor which is on the passenger side, along the firewall where the blower motor is located
-down towards the bottom by the inner fender arch you will see a large electrical connector which is connected to the blower motor resistor
-using an 8mm socket, 3” extension and a 3/8” ratchet, remove the two bolts holding in the unit
-this can be a fairly tight spot and you don’t necessarily have to remove the electrical connector first
-unfortunately I am unable to remove the electrical connect, I’m assuming the contacts are corroded which is a common issue amongst these trucks
-you can also disconnect the two upper electrical connectors to gain a little more room
-using the assistance of a couple interlocking pliers and a few minutes of wiggling the connector I managed to get it loose
-if yours are mildly corroded, you can allow the connector to soak for a couple hours in vinegar, then clean up using electrical contact cleaner
-if the connector is too far gone, purchase a replacement hardness and solder it into place
-reinstall the new resistor and apply some dielectric grease to the connector to help prevent corrosion
-connect the remaining connectors if removed and then test

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