# 2008 Audi A6 - Vibrates

**URL:** <https://community.cartalk.com/t/2008-audi-a6-vibrates/130521>\
**Category:** Maintenance/Repairs\
**Tags:** audi\
**Created:** [December 9, 2018, 6:15pm UTC](https://community.cartalk.com/t/2008-audi-a6-vibrates/130521 "2018-12-09T18:15:23Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Obi22](https://avatars.discourse-cdn.com/v4/letter/o/a87d85/32.png) [@Obi22](https://community.cartalk.com/u/Obi22)\
**Post date:** [December 9, 2018, 6:15pm UTC](https://community.cartalk.com/t/2008-audi-a6-vibrates/130521/1 "2018-12-09T18:15:23Z")

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When I put the AC on, a vibration effect is felt as if something is loosened in the engine but the AC cooling effect is fine. Any idea what the issue might be?

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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:** [December 9, 2018, 6:30pm UTC](https://community.cartalk.com/t/2008-audi-a6-vibrates/130521/2 "2018-12-09T18:30:19Z")

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The extra load the AC places on the engine may cause a rough idle. You might be overdue for routine maintenance such as spark plugs, air filter etc.  
you could also try a can of fuel system gasoline additive such as SeaFoam.