Where due you find the relay that controls the blower fan and its physical location on a 1990 LeSabre?

In a 1990 Buick LeSabre, the relay that controls the blower fan is typically located in the fuse box under the dashboard on the driver's side. To access it, remove the cover of the fuse box, and you should find the relay labeled for the blower motor. If you need to replace it, ensure you disconnect the battery to avoid any electrical issues.