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

Car used to sigh with relief when I left. Now it whistles at me!

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Old Jul 30, 2025 | 02:24 AM
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Car used to sigh with relief when I left. Now it whistles at me!

Hey folks. Refined comedy aside, how does one deal with the Airmatic pressure relief noise? I'm fine with the car letting out a puff, it actually sounds cool, but now it turned into a very loud whistle.

I could not find anything resembling a pressure relieve valve on the compressor. Is it just a matter of cleaning some air passage? Do I need to replace the whole valve, is it an o-ring that goes bad?
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Old Aug 1, 2025 | 09:18 AM
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The car is encouraging you to “Whistle while you work” to an annoying melody recalled from Looney Tunes in childhood.

Work you will. Get to it.
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Old Aug 3, 2025 | 12:20 AM
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Originally Posted by JohnLane
The car is encouraging you to “Whistle while you work” to an annoying melody recalled from Looney Tunes in childhood.

Work you will. Get to it.
Now that’s refined comedy.
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