# Recirculation Vent Cycles

**URL:** <https://community.cartalk.com/t/recirculation-vent-cycles/25479>\
**Category:** Maintenance/Repairs\
**Created:** [January 24, 2009, 10:32pm UTC](https://community.cartalk.com/t/recirculation-vent-cycles/25479 "2009-01-24T22:32:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sdwright](https://avatars.discourse-cdn.com/v4/letter/s/9d8465/32.png) [@sdwright](https://community.cartalk.com/u/sdwright)\
**Post date:** [January 24, 2009, 10:32pm UTC](https://community.cartalk.com/t/recirculation-vent-cycles/25479/1 "2009-01-24T22:32:58Z")

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I have a 2001 GMC Yukon XL. I am not able to switch the air flow between internal (recirculation) and external. When I try it seems that the vent is cycling back and forth between the two. I can hear something in the dash that sounds a bit like bees. Is there some way to disable this before something burns out or better yet is this something I could repair myself?

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**Author:** ![Roadrunner](https://avatars.discourse-cdn.com/v4/letter/r/d2c977/32.png) [@Roadrunner](https://community.cartalk.com/u/Roadrunner)\
**Post date:** [January 25, 2009, 2:09am UTC](https://community.cartalk.com/t/recirculation-vent-cycles/25479/2 "2009-01-25T02:09:50Z")

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The problem may be with a detached blend door or a faulty electrical blend door motor.

I had a motor replaced in my '02 Tahoe when I had a similar problem last year.