* Air springs (struts or bellows): These are the main components that provide the air cushioning. They're located at each corner of the vehicle, integrated into the suspension system at the struts or shock absorbers.
* Air compressor: This is usually located in the engine compartment and is responsible for pumping air into the air springs.
* Air dryer (or air drier): This component removes moisture from the compressed air to prevent corrosion and freezing in the system. Its location varies, sometimes in the engine bay, sometimes under the vehicle.
* Air tank (or reservoir): This stores compressed air to provide a buffer for the system and allows for quick adjustments. It's usually located under the vehicle, sometimes near the spare tire well.
* Height sensors: These sensors monitor the vehicle's height and send information to the control module to adjust air pressure accordingly. They're located at each corner of the vehicle.
* Control module (or Air Suspension Control Unit): This is the "brain" of the system, processing inputs from the sensors and controlling the compressor to maintain the correct ride height. It's usually located somewhere in the vehicle's electrical system, perhaps under the dash or in the engine bay.
To pinpoint the exact location of each component for *your* 1998 Cadillac, you'll need to consult a repair manual specific to your model (e.g., Seville, DeVille, Fleetwood). A visual inspection (with safety precautions) under the vehicle and in the engine compartment will also help, though be cautious of hot components.
