Originally Posted by willwren
You need to check for power at the fan motor with the climate control on High.
Even before that, get the car running with the blower control cranked to High, and try just thumping the blower motor housing with a broomstick or similar. (You know where to find it under the hood, yes?)
If it suddenly springs to life, you might get away with just cleaning and oiling it (or replacing it at worst). After you remove it, you have some access to the bearings through a couple holes in the side of the motor, and blasting some carb cleaner in there to clean the armature and brush assemblies, followed by a few drops of light oil on the bearings, can work well.