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The resister module is behind the blower motor right against the firewall. It is held in place by three 7/32 inch screws. The back two screws are very difficult to remove because of the insulation on the firewall. I have found it a little easier to slit the insulation on both sides of and just under the module and pull it down out of the way. Also it makes installation a little easier if you don't completely remove the two back screws. Take them out about half way, enough to pull the module down about 1/3 inch and slide the module forward and then down.

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Q: How do you replace a blower resistor on 1999 buick century?
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