* Complete air suspension failure? (Vehicle sits extremely low or won't raise at all)
* Uneven ride height? (One side is lower than the other)
* Slow to inflate/deflate? (Takes a long time to adjust height)
* Air leaks? (Hissing sounds, noticeable loss of air pressure)
* Rough ride? (Even if at the correct height, the ride is bumpy)
* Compressor issues? (Compressor runs constantly or not at all)
* Warning lights illuminated? (Check the dashboard for any related lights)
Once you identify the *specific* symptom, we can delve into possible causes. Here are some common culprits:
* Air Leaks: These are extremely common. Check the air lines for cracks, holes, or loose connections. Inspect the air springs (air bags) themselves for damage. Look for leaks at the compressor, valves, and height sensors. Using soapy water to check for bubbles around connections is a good way to find small leaks.
* Air Compressor: This is the pump that inflates the air springs. It might be failing, making unusual noises (like a grinding sound), or simply not turning on. Check the compressor's fuse and relay.
* Air Suspension Control Module (ACC): This electronic control unit manages the entire system. A faulty ACC can cause various issues.
* Air Springs (Air Bags): These can tear, rot, or otherwise fail, leading to a loss of air pressure and a sagging suspension.
* Height Sensors: These sensors tell the system the vehicle's height. A faulty sensor can lead to incorrect height adjustments.
* Air Lines and Fittings: Cracks, corrosion, or loose connections can cause leaks.
* Relays and Fuses: These protect the electrical components. A blown fuse or faulty relay can prevent the compressor from working.
Troubleshooting Steps:
1. Diagnose the specific problem: Describe the issue in detail.
2. Check fuses and relays: Look in the owner's manual for the location of the air suspension fuses and relays.
3. Listen for air leaks: Pay attention to hissing sounds around the air springs and lines.
4. Visually inspect air springs and lines: Look for any obvious damage.
5. Use soapy water to check for leaks: This is an effective way to detect small leaks.
6. Check the compressor: Listen for unusual noises and verify that it turns on when the system is engaged.
If you're not comfortable working on the air suspension yourself, it's best to take your Expedition to a qualified mechanic. Air suspension repair can be complex and require specialized tools and knowledge. Trying to fix it yourself without the proper expertise could worsen the problem.
