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The Mercedes-Benz GL-Class, especially the X164 and X166 generations, uses the Airmatic air suspension system to provide a comfortable ride and automatic ride-height control. Over time, the system can develop faults that cause the vehicle to sag, the compressor to run excessively, or warning messages to appear in the instrument cluster.Common failure symptoms include: the vehicle sitting lower on one corner or side after being parked, a continuously running air suspension compressor, a rough or bouncy ride, and dash messages such as 'Vehicle Level Too Low' or 'AIRMATIC Visit Workshop'.Frequent root causes are leaking front struts or rear air springs, cracked rubber bellows, a failed valve block unit, worn height sensors, corroded air lines, and a compressor that has overheated or failed due to moisture contamination in the desiccant cartridge.Diagnosing the system requires a Mercedes-Benz compatible scan tool or Xentry. Generic powertrain P-codes are usually not relevant for air suspension faults. Technicians often check the height sensor live values, command the compressor to run, and use soapy water to identify air spring leaks. A vehicle that drops quickly after shutdown usually points to a leaking spring or a faulty valve block.Replacement normally involves lifting the vehicle safely, removing the wheel and wheel well liner, disconnecting the air line, unbolting the upper and lower mounting points, and removing the old spring or strut. It is recommended to replace air springs in pairs and to replace the solenoid o-rings and seals while the system is open. After installation, the ride height must be recalibrated with diagnostic software.The rubber used in quality air springs is often based on chloroprene rubber, also known as polychloroprene or CR, compounded with reinforcing fabrics for durability and ozone resistance. Over time, microcracks can develop in the rubber bellows, leading to slow leaks that eventually become severe.Preventive maintenance includes keeping the system dry, inspecting the air springs for cracks or chafing, and replacing the compressor desiccant if the filter becomes saturated. A properly maintained GL-Class Airmatic system can provide many years of reliable service, but early diagnosis is key to avoiding compressor damage caused by continuous running with small leaks.