1. Check the Obvious:
* Fuses: Check the fuse(s) related to the air suspension system in the fuse box (under the hood and possibly inside the car). Consult your owner's manual for the correct fuse locations. Replace any blown fuses.
* Relay: The compressor likely operates through a relay. Locate the relay (again, your owner's manual is crucial) and check for proper operation. You can often swap it with a similar relay to test (if you have a spare).
* Power Supply: Test for power at the compressor's wiring harness connector. You'll need a multimeter to check for 12V DC when the system should be running. If no power is present, trace the wiring back to see where the circuit is broken.
2. Investigate the Air Suspension System Itself:
* Air Leaks: Significant air leaks in the system can cause the compressor to run constantly to maintain pressure. If the system is severely leaking, the compressor may have shut down due to overheating or a built-in safety mechanism. Check all air lines and suspension bags for leaks. Spray soapy water on the connections and bags to check for bubbles.
* Low Air Pressure: If the pressure is already low, some systems have a minimum pressure threshold before they'll activate the compressor. Check the pressure sensor if your model has one.
* Compressor itself: The compressor motor might be burned out. You can try tapping on it lightly while someone attempts to activate the system; a faint hum might indicate a problem with the motor rather than the electronics. This is risky, however, and should only be done if you have experience with electrical equipment.
3. Advanced Diagnostics:
* Air Suspension Control Module: The air suspension system is controlled by a module (computer). A faulty module could prevent the compressor from activating. Diagnosis usually requires a scan tool capable of reading codes from the air suspension system.
* Pressure Sensors: Faulty pressure sensors can send incorrect readings to the control module, leading to the compressor not activating. These typically require a scan tool for diagnosis.
Important Considerations:
* Safety: Working with electrical systems and compressed air can be dangerous. If you are not comfortable working on your car's electrical system, take it to a qualified mechanic.
* Owner's Manual: This is your most valuable resource. It will show you fuse box layouts, relay locations, and diagnostic information specific to your 1995 Lincoln Continental.
* Repair Manual: A repair manual (Haynes or Chilton) will provide detailed diagrams and procedures for troubleshooting and repairing the air suspension system.
By systematically checking these items, you should be able to narrow down the cause of the problem. Remember to always prioritize safety and seek professional help if needed.
