# 2011 Chevrolet Impala - Knocks

**URL:** <https://community.cartalk.com/t/2011-chevrolet-impala-knocks/171990>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet\
**Created:** [November 5, 2020, 3:25pm UTC](https://community.cartalk.com/t/2011-chevrolet-impala-knocks/171990 "2020-11-05T15:25:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Frank20](https://avatars.discourse-cdn.com/v4/letter/f/85e7bf/32.png) [@Frank20](https://community.cartalk.com/u/Frank20)\
**Post date:** [November 5, 2020, 3:25pm UTC](https://community.cartalk.com/t/2011-chevrolet-impala-knocks/171990/1 "2020-11-05T15:25:22Z")

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Knocking in vents in dash

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**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\
**Post date:** [November 5, 2020, 4:09pm UTC](https://community.cartalk.com/t/2011-chevrolet-impala-knocks/171990/2 "2020-11-05T16:09:00Z")

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Or are you hearing the actuators?

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [November 6, 2020, 2:23pm UTC](https://community.cartalk.com/t/2011-chevrolet-impala-knocks/171990/3 "2020-11-06T14:23:54Z")

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Broken heater/ac vent actuator. Common problem. $65 part, might be a headache to install, might not.