# AC acting funny

**URL:** <https://community.cartalk.com/t/ac-acting-funny/139218>\
**Category:** Maintenance/Repairs\
**Tags:** deville, cadillac\
**Created:** [April 25, 2019, 9:53am UTC](https://community.cartalk.com/t/ac-acting-funny/139218 "2019-04-25T09:53:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Caddimac](https://avatars.discourse-cdn.com/v4/letter/c/e9a140/32.png) [@Caddimac](https://community.cartalk.com/u/Caddimac)\
**Post date:** [April 25, 2019, 9:53am UTC](https://community.cartalk.com/t/ac-acting-funny/139218/1 "2019-04-25T09:53:44Z")

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I have a 2004 Caddilac deville dts. And resently my a.c. started blowing hot air out of the passenger side while blowing cool air out of the drivers side what can i do to fix thhis?

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**Author:** ![tcmichnorth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tcmichnorth/32/25126_2.png) [@tcmichnorth](https://community.cartalk.com/u/tcmichnorth)\
**Post date:** [April 25, 2019, 2:44pm UTC](https://community.cartalk.com/t/ac-acting-funny/139218/2 "2019-04-25T14:44:27Z")

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You have a mode door fault. These things have a calibration procedure. You should be able to find the procedure on the web. If that doesn’t work, you probably have a bad mode door actuator.

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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:** [April 25, 2019, 3:31pm UTC](https://community.cartalk.com/t/ac-acting-funny/139218/3 "2019-04-25T15:31:08Z")

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There’s a problem with the blend door on the passenger side.

It could be a bad blend door actuator, or a problem with the blend door itself.

Tester