# 2011 Mazda Mazda6 - AC powers down the engine

**URL:** <https://community.cartalk.com/t/2011-mazda-mazda6-ac-powers-down-the-engine/163638>\
**Category:** Maintenance/Repairs\
**Tags:** mazda\
**Created:** [April 30, 2020, 11:15pm UTC](https://community.cartalk.com/t/2011-mazda-mazda6-ac-powers-down-the-engine/163638 "2020-04-30T23:15:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![LauraAdkins](https://avatars.discourse-cdn.com/v4/letter/l/e68b1a/32.png) [@LauraAdkins](https://community.cartalk.com/u/LauraAdkins)\
**Post date:** [April 30, 2020, 11:15pm UTC](https://community.cartalk.com/t/2011-mazda-mazda6-ac-powers-down-the-engine/163638/1 "2020-04-30T23:15:34Z")

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when I use the defrost my engines rpms will power down is this the ait conditioning unti/compresser or possibly belt? this happened only after i had the spark plugs changed . have 87,000 miles on thius car

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**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\
**Post date:** [May 1, 2020, 1:07am UTC](https://community.cartalk.com/t/2011-mazda-mazda6-ac-powers-down-the-engine/163638/2 "2020-05-01T01:07:30Z")

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If the AC compressor is seized up, keeping the AC and defrost off, or removing the belt to the compressor, will prevent this until you can get it fixed.

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [May 1, 2020, 3:20am UTC](https://community.cartalk.com/t/2011-mazda-mazda6-ac-powers-down-the-engine/163638/3 "2020-05-01T03:20:37Z")

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The engine is supposed to compensate for the drag of the AC compressor. If it isn’t the idle control valve could be bad. You could also simply have a vacuum leak; whoever replaced the plugs could have knocked a vacuum line loose.