S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Air system intermittent gasp.

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Old Jan 30, 2022 | 09:02 PM
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2009 S550
Air system intermittent gasp.

Is it normal for the air system to occasionally gasp for air? Sound is coming from the front near the tank. Happens after shutdown or when a demand is placed on the system. Trunk opening etc. Thanks.
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Old Jan 30, 2022 | 11:06 PM
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1983 Nissan Shltbox
I think it's purging. I don't know for certain, but I think it's the car leveling itself out, balancing system pressures, and so forth after parking it. Mine does the same thing. Never even crossed my mind that it would be a malfunction. I think it's cool.
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Old Jan 31, 2022 | 11:33 AM
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S350 2008
It's normal, however the air hose connect to air pump is broken and make a gasp.
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Old Jan 31, 2022 | 12:27 PM
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S500
are we muddling up multiple systems here

the trunk closing I doubt has anything to do with the front of the car, does it not use a pump in the boot behind the rear seats?

at the front right near the headlamp is the airmatic suspension system that should be 100% air tight
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Old Jan 31, 2022 | 03:03 PM
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04 E55 AMG (totaled), 07 S550 4Matic, 14 E63S
Mine makes the same sound and I don't think anything is broken. I do find it odd because my E55 Airmatic is nearly silent.
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Old Jan 31, 2022 | 04:04 PM
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Quite often I get a big noise for a split second on switch off I think its the AC dumping moisture and it lands on the exhaust near the CAT (which is very hot) - I don't think it the Air suspension
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Old Jan 31, 2022 | 04:05 PM
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It's definitely the air suspension. At least my noise is. And probably Senecat's. And probably the OP...

It sounds like a purge.
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Old Jan 31, 2022 | 06:44 PM
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1983 Nissan Shltbox
^ yup. Just the car doing it's thing. There are about 700 sensors in these things constantly working to monitor and adjust things. The car self-levels. The system is just venting and equalizing. I think it's awesome. My car is alive even after I kill it.
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Old Jan 31, 2022 | 06:46 PM
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1983 Nissan Shltbox
Originally Posted by BOTUS
are we muddling up multiple systems here

the trunk closing I doubt has anything to do with the front of the car, does it not use a pump in the boot behind the rear seats?

at the front right near the headlamp is the airmatic suspension system that should be 100% air tight
Compressor is on the right, tank is on the left. Noise comes from a tank valve on the left. This thread is a non-issue, and a good heads-up for future reference.

/thread
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Old Jan 31, 2022 | 11:19 PM
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Yes, it's normal.
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