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Air blowing over an empty bottle

While driving i hear a sound like air blowing over an empty bottle.

Your radio isn’t working. Check the fuse.

can you hear the same at idle without moving ?

Yes, very faint and occasionally while at idle. I raised the hood, but I can’t tell where it’s coming from.

Radio works fine. SA

May be a leak in the airbox. Maybe a bearing noise. A stethoscope or a hose to the ear will help you locate. Throttle it at the linkage / throttle body under the hood and listen.

Possibly a leak in the power break booster which is vacuum powered

Would you walk up to a mechanic and say “Hey dude”, while driving I hear a sound like air blowing over a bottle" and expect him to be able to tell you what the noise is from? well why should someone be able to tell you over the internet?