air suspension issue hear the compressor running?

2008 MERCEDES BENZ E63 AMG
170,000 MILES • V8 • 2WD • AUTOMATIC
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BHAMDOC1
  • MEMBER
  • 423 POSTS
When it sits overnight the rear sinks, more on the driver side. Once you start the car it will start rising to a close to 100% level. I could hear the compressor running, and some hissing from rear driver side, then after a while all stops and its leveled. Then when I turn it off you could slowly see the driver rear sinking and a hiss. Do you know what usually goes wrong with these?
Jan 9, 2026 at 1:53 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,676 POSTS
The hiss is the clue, the system leaking, you need to find the source of the noise which is probably the level ride shocks. You can use a bottle of soapy water to help you, spray it near the noise and look for bubbles to confirm the source. Please upload an image or a short video in your response, so I can see what's going on.
Jan 10, 2026 at 1:35 AM
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