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Buick Century Blower Motor ResistorThe blower motor resistor is located on the back of the blower motor housing under the dash on the passenger side. It can be difficult to get at, but it is doable. Be ready with the ibuprofen the next day for your sore back.

Remove the cover panel from beneath the dash on the passenger side.

Unplug the power 'ribbon' wires leading to the resitor.

Unplug the wires that lead from the resitor to the blower motor housing. There are usually two, one black and one purple that share the same plug.

Remove the short hose that leads from the blower motor housing to the ventilation system ducts.

Remove the blower motor by removing the three hex screws that hold it in place.

Remove the resistor by removing the three hex screws that hold it in place. The resistor is right against the firewall so two of the screws are very difficult to reach. A slender flexible socket extension will make the job easier.

Attach the new resistor in place using the same hex screws. Only 1 or 2 of the original three are needed (the part is very light) if you do not feel like fighting with the ones next to the firewall.

Reatach the blower motor and reconnect the hose.

Plug the power cable wires back into the resitor and the wire from the resistor back into the blower motor.

Instead of hex screws mine were held in with 7/32 bolts. It was difficult, but easier than I had anticipated. I replaced two of the three bolts holding the resistor. The blower motor came with instructions saying that the plugs may have to be cut off of the resistor and the blower motor, then spliced together... I had to do this on mine.

I got everything back together and now the fan works on four of the five levels. It does not work on high.

I found on another site that said "high" uses a different circuit, with a separate fuse. I found the fuse panel on the passenger side of the dash when the door is open. The cover for the panel has all of the fuses mapped out, so it was easy to spot the 25 amp "Blower High Speed" fuse. I was very impressed to find the panel contained a fuse puller and replacement fuses. Mine was blown, I replaced it, and all is good with the world.

The information I received here was extremely helpful. Thank you.

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โˆ™ 2010-05-29 23:35:55
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โˆ™ 2014-10-08 12:34:54

Keep in mind if the new resistor burns out in a short time, next time replace the blower motor also. A failing blower motor can be the cause of burning out the resistor.

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Q: How do you replace the resistor on the blower motor of a 2002 Buick Century The fan works are on higher speeds only Does not work on low speeds?
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