To be certain, you should:
* Consult your owner's manual: This is the best resource for the exact location for your specific vehicle.
* Check online forums: Searching for "2000 Ford Expedition air suspension compressor location" on forums like Ford-trucks.com or Expedition forums can yield helpful pictures and information from other owners.
* Look underneath the vehicle: With the vehicle safely supported on jack stands, carefully inspect the area around the rear axle on the driver's side. The compressor is usually a relatively small, cylindrical unit with air lines connected to it.
Remember to always use safety precautions when working under a vehicle. Use jack stands, not just a jack, and wear appropriate safety gear.