# Vacuume wipers and ac vents

**URL:** <https://community.cartalk.com/t/vacuume-wipers-and-ac-vents/52088>\
**Category:** Maintenance/Repairs\
**Created:** [July 19, 2010, 12:53am UTC](https://community.cartalk.com/t/vacuume-wipers-and-ac-vents/52088 "2010-07-19T00:53:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jeffjb](https://avatars.discourse-cdn.com/v4/letter/j/b9bd4f/32.png) [@jeffjb](https://community.cartalk.com/u/jeffjb)\
**Post date:** [July 19, 2010, 12:53am UTC](https://community.cartalk.com/t/vacuume-wipers-and-ac-vents/52088/1 "2010-07-19T00:53:03Z")

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My ac vents close when I go up a hill and open when I go down the hill and decelerate the vents open allowing cool air into the cab. It reminds me of my old Jeeps with vacuum wipers. When you go up a hill they slow down to almost a stop but when you decelerate the go like a bat out of hell.

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**Author:** ![kizwiki](https://avatars.discourse-cdn.com/v4/letter/k/7cd45c/32.png) [@kizwiki](https://community.cartalk.com/u/kizwiki)\
**Post date:** [July 19, 2010, 1:50am UTC](https://community.cartalk.com/t/vacuume-wipers-and-ac-vents/52088/2 "2010-07-19T01:50:27Z")

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The vents in your cabin are controlled by vacuum. you have a vacuum leak.