# Strange "whining" noise coming from inside back of car

**URL:** <https://community.cartalk.com/t/strange-whining-noise-coming-from-inside-back-of-car/23405>\
**Category:** Maintenance/Repairs\
**Created:** [December 14, 2008, 7:14pm UTC](https://community.cartalk.com/t/strange-whining-noise-coming-from-inside-back-of-car/23405 "2008-12-14T19:14:18Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![parker3](https://avatars.discourse-cdn.com/v4/letter/p/b19c9b/32.png) [@parker3](https://community.cartalk.com/u/parker3)\
**Post date:** [December 14, 2008, 7:14pm UTC](https://community.cartalk.com/t/strange-whining-noise-coming-from-inside-back-of-car/23405/1 "2008-12-14T19:14:18Z")

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i have a 1994 Mercedes-Benz C280. there is this whining noise which starts when I turn on the A/C system. It lasts for about 15 seconds and goes off and then comes on again in about 15 seconds, and comes on and off like that as long as the A/C system is turned on. Anybody know what I need to do to fix this anoying noise?

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**Author:** ![Beadsandbeads](https://avatars.discourse-cdn.com/v4/letter/b/c57346/32.png) [@Beadsandbeads](https://community.cartalk.com/u/Beadsandbeads)\
**Post date:** [December 14, 2008, 7:30pm UTC](https://community.cartalk.com/t/strange-whining-noise-coming-from-inside-back-of-car/23405/2 "2008-12-14T19:30:25Z")

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My WAG is a stepper motor that is directing air flow in the HVAC system. Indications are that something is broken so it times-out and then recycles to try again.