Blower Motor Resistor Testing. With that said, failed blower resistor assemblies don't solve all of the possible failures. Locate the blower motor resistor on the passenger side under the dash board. This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. Place the assembly back into the blower box and secure it with the 2 screws, do not over tighten. Disconnect the wires from the blower motor. The blower motor will be attached at the bottom of the plastic climate control unit, usually with screws. Carefully slide the motor out of the housing—there will be a plastic wheel on the far side of the motor. Put in a new resistor and used jumper wires to test the blower motor and the motor works. Plug your replacement blower motor resistor assembly into the appropriate wire connectors until they snap into place. Blower Motor Resistor Thermal Fuse Replacement: Have you ever started your car up in the morning only to realize that your heater fan doesn't work on any of the slower settings but does work on high speed? The blower motor resistor is located under the passenger side of the dash next to the blower motor. Place the ducting cover back into place and re-insert the clips. We use cookies to give you the best possible experience on our website. It is not necessary to remove the blower motor to change the resistor. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. In, fact, this … Well, my friend did. If the blower motor still works on high, but will not work on any other speed, it usually points to a bad blower motor resistor. On most vehicles, the highest blower motor speed setting bypasses the blower motor resistor to give the fan full vehicle voltage (typically between 12 and 14.4 volts). It is responsible for controlling the blower motor’s fan speed. It is mounted to the the blower housing near the blower motor. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. If the blower moter only works on hi speed it is the blower motor resistor that is bad. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. - Answered by a verified Chevy Mechanic. How do you replace the Blower Motor Resistor for a 2002 Chevy Malibu? The user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor … If you went to Autozone it'll look something like this. It has auto heat and the front blower is not working. At this point you can either remove the connector from the resistor pack or it's melted in there from overheating and it won't come out to save your life and you need to just take the plunge and cut the wires off, but first I'd make sure you have a replacement set on hand. Many blower resistors control current to the blower motor in all speeds except high. Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. I have a 2001 Town and Country 3.8L. The blower resistor is connected in series with the blower fan. Remove the screws holding the blower motor to the climate control unit. An A/C blower motor resistor uses resistance to control the speed of the blower motor. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. Has auto heat and the motor directly from the switch assembly into the appropriate wire connectors until snap. 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