How do you change fan switch on Buick century?

To change the fan switch on a Buick Century, first disconnect the battery to ensure safety. Remove the dashboard panel to access the switch, then unscrew and disconnect the old fan switch from its wiring harness. Install the new fan switch by connecting it to the wiring harness and securing it with screws, then reassemble the dashboard panel and reconnect the battery. Test the new switch to ensure it functions properly.