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Q: Weird sound in the cooling system when I turn off the engine on 2007 Mercedes-Benz GL450

I bought the car a few weeks ago and didn't notice it until a couple of days ago. When I turn off the engine, after a few seconds I hear a "ffffffff" sound. like if it was releasing some kind of pressure. Any one has any idea of what it could be???
Thanks.
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This sounds like it is the airmatic sytem that is releasing air from the air suspension. It's normal.
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