To find it, you need to:
1. Consult your owner's manual: This is the best resource. It will have a fuse diagram showing the location of each fuse and its corresponding function.
2. Check both fuse boxes: The underhood fuse box is usually a large box near the battery. The passenger compartment fuse box is often located under the dashboard, sometimes in the glove box area or under a panel near the steering wheel. Look carefully at the fuse box covers; they usually have diagrams printed on the inside showing what each fuse controls.
3. Look for a fuse labeled "Power Windows" or a similar description. If you can't find a fuse specifically labeled "Power Windows," it may be combined with other functions (like the power locks or mirrors).
4. If your owner's manual is unavailable, search online for a 1998 Ford Expedition fuse box diagram. Many websites and forums (like Ford-specific forums) have these diagrams available, often categorized by trim level or specific options. Make sure the diagram matches your exact vehicle configuration before using it.
Without the owner's manual or a specific trim level identified, it's impossible to give a precise location. Thoroughly checking both fuse boxes with the aid of a diagram is necessary.