# Dash vents not blowing air. 2003 GMC Envoy

**URL:** <https://community.cartalk.com/t/dash-vents-not-blowing-air-2003-gmc-envoy/33644>\
**Category:** Maintenance/Repairs\
**Tags:** envoy, gmc\
**Created:** [July 19, 2009, 4:19pm UTC](https://community.cartalk.com/t/dash-vents-not-blowing-air-2003-gmc-envoy/33644 "2009-07-19T16:19:42Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![GMC\_Envoy](https://avatars.discourse-cdn.com/v4/letter/g/ec9cab/32.png) [@GMC\_Envoy](https://community.cartalk.com/u/GMC_Envoy)\
**Post date:** [July 19, 2009, 4:19pm UTC](https://community.cartalk.com/t/dash-vents-not-blowing-air-2003-gmc-envoy/33644/1 "2009-07-19T16:19:42Z")

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My wife recently started our 2003 GMC Envoy and heard a “pfffh” from the dash which makes think a vacuum line came loose. When she parked the car it wouldn’t start because the battery had died. I put in a new battery and now the dash board vents do not blow air. The lower vents, the defrost vents, 4wd, AC all continue to work. Thoughts

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [July 19, 2009, 8:59pm UTC](https://community.cartalk.com/t/dash-vents-not-blowing-air-2003-gmc-envoy/33644/2 "2009-07-19T20:59:45Z")

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If the vents are vacuum controlled I agree and think you are correct.

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**Author:** ![GMC\_Envoy](https://avatars.discourse-cdn.com/v4/letter/g/ec9cab/32.png) [@GMC\_Envoy](https://community.cartalk.com/u/GMC_Envoy)\
**Post date:** [July 19, 2009, 9:07pm UTC](https://community.cartalk.com/t/dash-vents-not-blowing-air-2003-gmc-envoy/33644/3 "2009-07-19T21:07:34Z")

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Thanks. I think I may have found my answer here [http://www.sparkys-answers.com/2009/05/2003-gmc-envoy-no-ac-vent-control-b0263.html](http://www.sparkys-answers.com/2009/05/2003-gmc-envoy-no-ac-vent-control-b0263.html)

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [July 20, 2009, 2:35am UTC](https://community.cartalk.com/t/dash-vents-not-blowing-air-2003-gmc-envoy/33644/4 "2009-07-20T02:35:38Z")

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Interesting info you found there. I suspect you are on the right path to the cure.