# Ac?

**URL:** <https://community.cartalk.com/t/ac/5893>\
**Category:** Maintenance/Repairs\
**Created:** [October 13, 2007, 3:51pm UTC](https://community.cartalk.com/t/ac/5893 "2007-10-13T15:51:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ambtrans](https://avatars.discourse-cdn.com/v4/letter/a/7993a0/32.png) [@ambtrans](https://community.cartalk.com/u/ambtrans)\
**Post date:** [October 13, 2007, 3:51pm UTC](https://community.cartalk.com/t/ac/5893/1 "2007-10-13T15:51:47Z")

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My AC went out this spring. In Aug I tried it again to varify that I wasn’t needlessly suffering. Ever since then my pick up ( Chevy Silverado 150 ) has a knocking comming from behind where you charge the AC. It will occure for about 30 seconds after turning the key on OR off. I am also getting a low grinding sound ( like an old water wheel or a gear running slow ). This is continual even at an idle. Any ideas? Any conecttion? Thinking maybe compressor or silanoid.