Why do I hear a hissing sound from the air suspension when the vehicle is parked?

Steve Mowat

Steve Mowat

Steve Mowat, Owner of Avantgarde Automotive, began as a BMW apprentice in 1997, then excelled at McLaren and Mercedes-Benz. In 2009, he founded his business.

Identifying the Source of the Hissing Sound

When you hear a hissing sound from the air suspension system in your Mercedes Benz, it might be both baffling and concerning. It’s essential to precisely identify the problem, especially when it concerns specific models.

For instance:

  • Mercedes-Benz S-Class (2010-2014): Commonly reported solenoid valve leak. Part number A2223200458.
  • Mercedes-Benz E-Class (2016-2018): Issue often traced to faulty O-rings in the air strut. Part number A2123203238.

Photo location: Image of various air suspension components with caption, “Different components of Mercedes-Benz Air Suspension System.”

Tools and Parts Required

To tackle this issue, the following tools and parts are necessary:

  • Air Suspension Leak Detection Kit
  • Torque Wrench
  • Replacement O-rings, valves, or struts depending on the diagnosis
  • Lubricants and sealants as required

For detailed assistance on servicing and repairs, you can consult Avantgarde Automotive’s servicing and repair section.

Tips and Tricks to Resolve the Problem

1. Leak Detection: + Utilise a leak detection kit and follow the user manual. + Inspect all connections, valves, and struts. + Focus on common leak points identified in your specific model.

2. Replacing Faulty Components: + If a solenoid valve is the culprit, replace it with the specific part number mentioned above. + If an O-ring is found to be faulty, ensure the replacement part is of the exact dimensions.

3. 4-Wheel Alignment Check: + After the repair, ensure a proper 4-wheel alignment. + This process helps in maintaining optimal ride quality.

Costs Involved

You must be aware of the potential costs for various parts and professional assistance:

  • Solenoid Valve Replacement: £100 – £200
  • O-Ring Replacement: £50 – £100
  • Professional 4-wheel alignment: £75 – £150

Don’t Hesitate to Seek Professional Assistance

While these tips are indeed valuable, it might be wise to consult a professional if the problem persists. The team at Avantgarde Automotive offers expert servicing for all Mercedes-Benz models.

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