The air compressor for the rear suspension (ALS - Air Leveling System) on a Cadillac DeVille Concours is typically located in the
rear of the vehicle, near the spare tire. However, the exact location might vary slightly depending on the model year. It's often mounted on the frame or near the shock absorbers.
To be certain, you'll need to consult your owner's manual or a repair manual specific to your vehicle's year. A visual inspection in the rear of the car, looking near the spare tire and along the frame rails, is also helpful. The compressor is usually a fairly sizable unit with several hoses attached.
