# 2004 Ford Explorer AC sometimes sounds like a police siren

**URL:** <https://community.cartalk.com/t/2004-ford-explorer-ac-sometimes-sounds-like-a-police-siren/179357>\
**Category:** Maintenance/Repairs\
**Tags:** explorer, ford\
**Created:** [September 14, 2021, 2:21pm UTC](https://community.cartalk.com/t/2004-ford-explorer-ac-sometimes-sounds-like-a-police-siren/179357 "2021-09-14T14:21:08Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![DaveMowser](https://avatars.discourse-cdn.com/v4/letter/d/838e76/32.png) [@DaveMowser](https://community.cartalk.com/u/DaveMowser)\
**Post date:** [September 14, 2021, 2:21pm UTC](https://community.cartalk.com/t/2004-ford-explorer-ac-sometimes-sounds-like-a-police-siren/179357/1 "2021-09-14T14:21:08Z")

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Noise from ac behind front seat occationally sounds like a police siron

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**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\
**Post date:** [September 14, 2021, 5:45pm UTC](https://community.cartalk.com/t/2004-ford-explorer-ac-sometimes-sounds-like-a-police-siren/179357/2 "2021-09-14T17:45:47Z")

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it sounds like the bearing in your rear a/c fan blower is worn out.

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**Author:** ![eddo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/eddo/32/2594_2.png) [@eddo](https://community.cartalk.com/u/eddo)\
**Post date:** [September 14, 2021, 9:31pm UTC](https://community.cartalk.com/t/2004-ford-explorer-ac-sometimes-sounds-like-a-police-siren/179357/3 "2021-09-14T21:31:09Z")

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> [@weekend-warrior](#):
>
> it sounds like the bearing in your rear a/c fan blower is worn out.

or something crawled in there and is screaming for help 🤣 🤣

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**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\
**Post date:** [September 14, 2021, 9:42pm UTC](https://community.cartalk.com/t/2004-ford-explorer-ac-sometimes-sounds-like-a-police-siren/179357/4 "2021-09-14T21:42:09Z")

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> [@eddo](#):
>
> something crawled in there and is screaming for help

+1  
In any event, I’m still trying to figure out what a “siron” is.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [September 14, 2021, 9:56pm UTC](https://community.cartalk.com/t/2004-ford-explorer-ac-sometimes-sounds-like-a-police-siren/179357/5 "2021-09-14T21:56:34Z")

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The expansion valve for the rear AC is defective.

The noise is from the refrigerant passing thru the bad expansion valve.

Tester