You should raise and support the vehicle, turn the ignition On, with the engine OFF, install a scan tool, with the scan tool, exhaust the air from the system for at least 60 seconds, disconnect the air tube from the air dryer, disconnect the electrical connection, remove the air inlet and hose from the fuel filler neck bracket, loosen the mounting nuts, slide the air compressor rearward to clear the frame slot and remove the air compressor from the vehicle.