A 1991 Chevrolet Caprice uses a variety of fuses, both
blade-type fuses and
ATO (Automotive Type) fuses. There's no single "kind" of fuse; different amperage ratings are used throughout the car's electrical system to protect various circuits. You'll find them in the underhood fuse box and potentially an interior fuse panel (usually located under the dash).
To know the *exact* type and amperage for a specific circuit, you need to consult your owner's manual. It will have a fuse box diagram showing the fuse location and rating for each circuit. The diagram will also often indicate the type of fuse used (ATO/ATC are often interchangeable).
