* Air Leaks: This is the most common cause. Check for leaks in the air lines, air springs (air bags), and connections throughout the system. Leaks can be subtle and hard to find; soapy water sprayed on connections is a good way to detect them. Look for hissing sounds as well.
* Faulty Air Suspension Valves/Solenoids: These control the flow of air to different parts of the system (e.g., front left, front right, rear). A faulty valve could be preventing air from reaching specific suspension components or vents. A diagnostic scan might reveal codes related to these valves.
* Clogged Air Lines: Dust, dirt, or debris can clog the air lines, restricting or completely blocking airflow.
* Damaged Air Springs (Air Bags): A ruptured or severely weakened air spring might not hold air, even if the compressor is working. These are relatively expensive to replace.
* Air Suspension Height Sensor: While less likely to prevent *all* air from reaching the vents, a faulty height sensor could cause the system to malfunction and not properly distribute air.
* Compressor Relay or Fuse: Though you say the compressor is running, a weak relay or blown fuse could be limiting its power, preventing it from generating sufficient pressure.
Troubleshooting Steps:
1. Listen Carefully: Does the compressor run constantly? It should cycle on and off. Continuous running might indicate a leak somewhere.
2. Visual Inspection: Carefully inspect all air lines, connections, and air springs for visible damage or leaks.
3. Soapy Water Test: Spray soapy water on all connections and suspect areas to look for bubbles, which indicate leaks.
4. Check Fuses and Relays: Locate the fuses and relays associated with the air suspension system in your owner's manual or online. Check for blown fuses or faulty relays.
5. OBD-II Scan: A diagnostic scan using an OBD-II reader can reveal trouble codes related to the air suspension system. This can help pinpoint the faulty component.
6. Professional Diagnosis: If you can't find the problem yourself, a qualified mechanic specializing in air suspension systems should be able to diagnose and repair the issue. This is especially recommended if you suspect a problem with the air springs or valves, as they require specialized tools and knowledge.
Remember safety first! Air suspension systems operate under pressure, so be cautious when inspecting them. If you're not comfortable working with air suspension systems, leave it to a professional.
