The hood open on my 1998 Ford Expedition because the battery is dead.?

A dead battery won't directly cause the hood to open on a 1998 Ford Expedition (or any car for that matter). The hood release is a mechanical system. The dead battery simply means you can't use the power-operated hood release button inside the car.

You'll need to open the hood manually. There's usually a cable release somewhere under the dash, often near the bottom left or right, depending on the vehicle. You'll need to feel around for a small lever or pull handle. Sometimes there's a small access panel to open to reach the cable. Your owner's manual should show you the location of the emergency hood release.

If you can't locate the manual release, you may need to search online for "1998 Ford Expedition manual hood release location" to find diagrams or videos showing how to access it. Failing that, you'll need roadside assistance or a mechanic.