# Harmonic Noise Vent System

**URL:** <https://community.cartalk.com/t/harmonic-noise-vent-system/72713>\
**Category:** Maintenance/Repairs\
**Created:** [May 29, 2012, 7:36am UTC](https://community.cartalk.com/t/harmonic-noise-vent-system/72713 "2012-05-29T07:36:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Heales](https://avatars.discourse-cdn.com/v4/letter/h/ee7513/32.png) [@Heales](https://community.cartalk.com/u/Heales)\
**Post date:** [May 29, 2012, 7:36am UTC](https://community.cartalk.com/t/harmonic-noise-vent-system/72713/1 "2012-05-29T07:36:29Z")

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2008 Suzuki Grand Vitari V6 4WD. What could be causing a harmonic noise upon reaching 50 to 60 mph? It is intermittent and can last for hours on a long trip. It doesn’t matter if AC is on. It sounds like a piece of plastic is stuck in the air vents, a high pitch.

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**Author:** ![missileman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/missileman/32/1366_2.png) [@missileman](https://community.cartalk.com/u/missileman)\
**Post date:** [May 29, 2012, 4:24pm UTC](https://community.cartalk.com/t/harmonic-noise-vent-system/72713/2 "2012-05-29T16:24:47Z")

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Check the trim around your windshield. Be very thorough because one little piece can make a whole lot of noise at highway speeds.