On a 1995 Buick Riviera with an air ride suspension (a relatively rare option), the air compressor is typically located
in the engine compartment. However, the exact location within the engine bay can vary slightly. It's often found near the firewall, possibly tucked away somewhat. It's a relatively small, cylindrical unit and will likely have air lines running to and from it.
Because it's not a standard feature, a visual inspection of your engine bay is the most reliable way to locate it. You can also consult a 1995 Buick Riviera repair manual specific to your vehicle's options for a more precise diagram.
