Car is making a really soft hallow whistling sound, but only when idling

Is this something that requires immediate attention? There's no performance issues but I'm wondering if it can snow ball into something worst. It's a 2004 honda civic 180, xxx miles

Try to determine where the sound is coming from. There's a vacuum system in your car, which uses suction to operate certain features. If there's a leak in that system, I suppose you could hear something like that. I have heard 'whistling' come out of the heater/vent system before.

Could be a vacuum leak.

Not totally sure but, it sounds like you have a vacuum leak somewhere.
Hope this helps.

Vacuum leak from head pipe to brake servo. Easy one that.

It may be bad drive belt pulley bearings or a vacuum leak.

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