To find it, you'll likely need to:
* Look carefully under the dashboard: Use a flashlight to get a good view of the area. It's usually a small, square or rectangular box with a button on it.
* Consult your owner's manual: If you have the original manual, it should show the location of the inertia switch.
* Check online resources: Search for "1994 Ford Aerostar inertia switch location" on the internet. You might find pictures or diagrams that show the specific location on a similar vehicle.
If you can't find it after a thorough search, consulting a Ford mechanic or auto parts store might be helpful. They may have diagrams or information specific to your year and model.