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2020 Aviator Reserve Air Suspension Sagging - Compressor Always On

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Kevin B. · rep 0 · May 22, 6:03 AM · 1 replies · solved · Question

Vehicle: 2020 Lincoln Aviator Reserve

Hey everyone,

I'm having some trouble with the air suspension on my 2020 Lincoln Aviator Reserve. For the past few weeks, I've noticed the rear end of the vehicle sags significantly overnight, sometimes even after just a few hours. When I start it up, the compressor kicks on and runs for a really long time, and it sounds louder than usual, almost like it's struggling.

Eventually, it airs up, but then I'll get an 'Air Suspension Fault' message on the dash. It seems to drive okay once it's up, but I'm worried about the compressor constantly running and the sagging. Has anyone else experienced this with their Aviator? What are the common culprits for this kind of behavior?

Any advice on what I can check myself before taking it to the dealership would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:03 AM

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Hi Sarah, it sounds like your Aviator's air suspension system is definitely experiencing some issues. This is a common concern with air suspension systems as vehicles age, though a 2020 model is still relatively new.

Here are the most common causes for the symptoms you're describing:

  • Air Spring/Strut Leaks: The rubber bladders in the air springs can develop small cracks or punctures over time, especially in the rear. This allows air to escape, causing the vehicle to sag, particularly overnight. The compressor then works overtime trying to maintain ride height.
  • Faulty Air Compressor: If the compressor is running constantly and loudly, it might be struggling to build pressure due to internal wear, a leak in its lines, or a failing motor. Constant operation can lead to overheating and eventual failure.
  • Height Sensor Malfunction: The vehicle's height sensors tell the control module how much air to add or release. A faulty sensor can give incorrect readings, leading to incorrect ride height or constant compressor cycling.
  • Air Line Leaks: Less common, but a damaged air line connecting the compressor to the springs can also cause leaks.

What you can do to diagnose:

  1. Visual Inspection: Park your Aviator on a level surface. With the engine off, spray a soapy water solution (dish soap and water) on the air springs, air lines, and around the compressor. Look for bubbles forming, which indicate an air leak. Pay close attention to the top and bottom seals of the air springs.
  2. Listen to the Compressor: Note if the compressor sounds excessively loud, strained, or if it cycles on and off much more frequently than usual. A healthy compressor should run relatively quietly for short periods.
  3. Check Fuses and Relays: Consult your owner's manual for the location of the air suspension compressor fuse and relay. Check them for continuity. A blown fuse or faulty relay can prevent the compressor from working correctly.
  4. Scan for Diagnostic Trouble Codes (DTCs): An "Air Suspension Fault" message almost certainly means there are stored codes. Use an OBD-II scanner (preferably one that can read chassis codes, not just powertrain) to check for codes like C1A00 (Compressor Malfunction), C1A20 (Pressure Sensor Fault), or codes related to specific height sensors (e.g., C1A30 for a rear height sensor). These codes will point you directly to the problematic component.

When to see a professional shop: If you've performed the basic checks and can't identify the source of the leak, or if the OBD-II codes point to internal compressor failure, control module issues, or complex sensor problems, it's best to take your Aviator to a qualified technician. Driving with a compromised air suspension can affect handling, braking, and tire wear, posing a safety risk. Early diagnosis can also prevent further damage to components like the compressor from overworking.

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