# Mazda 9 air conditioner problem

**URL:** <https://boards.straightdope.com/t/mazda-9-air-conditioner-problem/750576>\
**Category:** Factual Questions\
**Created:** [March 29, 2016, 10:03pm UTC](https://boards.straightdope.com/t/mazda-9-air-conditioner-problem/750576 "2016-03-29T22:03:05Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![obbn](https://avatars.discourse-cdn.com/v4/letter/o/d6d6ee/32.png) [@obbn](https://boards.straightdope.com/u/obbn)\
**Post date:** [March 29, 2016, 10:03pm UTC](https://boards.straightdope.com/t/mazda-9-air-conditioner-problem/750576/1 "2016-03-29T22:03:05Z")

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Hello Everyone,  
We own a 2007 Mazda 9 that has recently be doing something very strange. When I shut off the car the air conditioner fan stats blowing and stays on for a few minutes. This happens regardless of the fan being on or off prior to turning the key off. Then the key back to in and the fan stops blowing (if it was turned off). This is strange. Any idea whysit’s doing this?

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**Author:** ![Gary\_T](https://avatars.discourse-cdn.com/v4/letter/g/3ec8ea/32.png) [@Gary\_T](https://boards.straightdope.com/u/Gary_T)\
**Post date:** [March 29, 2016, 10:36pm UTC](https://boards.straightdope.com/t/mazda-9-air-conditioner-problem/750576/2 "2016-03-29T22:36:51Z")

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What precisely do you mean by air conditioner fan? Is it in the engine compartment, blowing across the A/C condenser? Or do you mean the blower motor inside the cab, blowing through the ducts used for heat, defrost, vent, and A/C?

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**Author:** ![core](https://avatars.discourse-cdn.com/v4/letter/c/d26b3c/32.png) [@core](https://boards.straightdope.com/u/core)\
**Post date:** [March 29, 2016, 10:37pm UTC](https://boards.straightdope.com/t/mazda-9-air-conditioner-problem/750576/3 "2016-03-29T22:37:27Z")

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I was confused by the mention of “air conditioner fan” thinking you meant the condenser fan by the radiator, but I’m guessing you mean the blower motor inside the car? i.e. the same fan that’s used for the heater?

If so, see the service bulletin: TSB 07-003/11 2007-2010 CX-9 - BLOWER MOTOR STAYS ON AFTER KEY OFF.

You’ll need 2 new relays, part #L1Y1-67-730. They’re about $4-5 each.

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**Author:** ![obbn](https://avatars.discourse-cdn.com/v4/letter/o/d6d6ee/32.png) [@obbn](https://boards.straightdope.com/u/obbn)\
**Post date:** [March 29, 2016, 11:13pm UTC](https://boards.straightdope.com/t/mazda-9-air-conditioner-problem/750576/4 "2016-03-29T23:13:20Z")

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It’s the blower motor inside the cab, pushing air through the vents

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**Author:** ![Philster](https://avatars.discourse-cdn.com/v4/letter/p/13edae/32.png) [@Philster](https://boards.straightdope.com/u/Philster)\
**Post date:** [March 30, 2016, 5:28pm UTC](https://boards.straightdope.com/t/mazda-9-air-conditioner-problem/750576/5 "2016-03-30T17:28:48Z")

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**core** got it already. Known problem, and their is a tech service bulletin (TSB) on this, with boring details:

> **[Mazda CX-9 - Blower Motor Stays On After Key is Turned Off](https://blog.yagelski.com/2011/10/mazda-cx-9-blower-motor-stays-on-after.html)**
>
> A few weeks ago, our 2007 Mazda CX-9 Grand Touring model started doing something rather peculiar. When we turned-off the vehicle, the rear ...

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**Author:** ![obbn](https://avatars.discourse-cdn.com/v4/letter/o/d6d6ee/32.png) [@obbn](https://boards.straightdope.com/u/obbn)\
**Post date:** [March 30, 2016, 10:37pm UTC](https://boards.straightdope.com/t/mazda-9-air-conditioner-problem/750576/6 "2016-03-30T22:37:23Z")

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Thanks everyone