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Mazda CX-9 Heating Ventilation Air Conditioning

34 messages,  Last post on Dec 02, 2009 at 1:31 PM

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What is this discussion about? Mazda CX-9, Heating / Cooling, SUV

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#25 of 34 2007 CX9 Rear Air Stays On by mford1970 Jan 11, 2009 (3:15 pm)
I think this car has an electrical gremlin. The trip odometers reset themselves regularly and the dash dim light (for when the headlights come on) also resets itself. Now, within the last two months, when you turn off the car the rear air comes on. The first time my wife just turned the car on and back off. This would fix the problem. Today when it happened, I turned the car back on and turned off all air controls. I then turned the car off and the rear vents were still blowing. I turned the car back on and off again. The rear air remained on for over six minutes. I turned the car on and off again at this point and it finally turned off. This has happened four times in two months.   Has anyone else had this problem or the odometer ones? I took it to the dealer three months ago when the check engine light came on and the car started to run real rough and then would die. Took them three days to figure out a vaccuum line had broken near the firewall. They never could figure why the meters reset. Replies to this message: ceric (Jan 12, 2009 9:14 am)
#26 of 34 Re: 2007 CX9 Rear Air Stays On [mford1970] by ceric Jan 12, 2009 (9:14 am)
Replying to: mford1970 (Jan 11, 2009 3:15 pm) Did you install accessories recently? It seems like some electrical short exists in your vehicle (that causes improper grounding). You need to have it checked out by your dealers before the OE warranty expires.
#28 of 34 air conditioning stays on when car is off by bigdog19 Oct 28, 2009 (3:04 pm)
we are NOT car people. have a 2007 Mazda cx9. when you turn the key off and remove the key the air conditioning stays on and you can still make the windows go up and down. the A/C turns off after about 30 seconds to a minute. is this some new thing or is our electrical system messed up? thanks in advance for the help. Replies to this message: imamg (Nov 02, 2009 4:21 pm) 08mazdaowner (Dec 02, 2009 11:44 am) vg33e power (Dec 02, 2009 12:14 pm) ceric (Dec 02, 2009 1:31 pm)
#31 of 34 Re: air conditioning stays on when car is off [bigdog19] by imamg Nov 02, 2009 (4:21 pm)
Replying to: bigdog19 (Oct 28, 2009 3:04 pm) There is a window of time that allows you to still use the windows, this is normal... the ac/ staying on after the car is turned off is not normal...and there's a known issue with it. There's a relay that hangs open too long. Ask your dealer about it. It's not a difficult repair.
#32 of 34 Re: air conditioning stays on when car is off [bigdog19] by 08mazdaowner Dec 02, 2009 (11:44 am)
Replying to: bigdog19 (Oct 28, 2009 3:04 pm) I have a 2008 CX9 and took my car in today as it was doing the same thing...it's the relay switch and they are charging me $149 to fix it...I wish I had researched it more before paying so much!!! If you are past the 36k warranty, it's not covered... Replies to this message: vg33e power (Dec 02, 2009 12:14 pm) ceric (Dec 02, 2009 1:31 pm)
#33 of 34 Re: air conditioning stays on when car is off [08mazdaowner] by vg33e power Dec 02, 2009 (12:14 pm)
Replying to: 08mazdaowner (Dec 02, 2009 11:44 am) WOW! $149 to open hood, pop off relay box lid, remove both front and rear blower relays, install 2 X $20 relays, snap relay box lid back on, close hood and voila!! Replies to this message: ceric (Dec 02, 2009 1:31 pm)
#34 of 34 Re: air conditioning stays on when car is off [vg33e power] by ceric Dec 02, 2009 (1:31 pm)
Replying to: vg33e power (Dec 02, 2009 12:14 pm) There is a reason why knowing your vehicle costs you much less in maintenance. If the same had happened to me, I would read the TSB first, and try it fix it myself if my CX9 was out of warranty.   Another thing people should consider is it to call MazdaUSA corporate. If you argue your case calmly, Mazda could pay for the parts, and you pay for the labor cost. It helps, but not entirely. This is especially true when your CX9 is barely beyond 36K miles.   Anyway, early models (2008) have more problems (already better than 2007). Buying a 2010 model should be a much safer decision.   I personally am not aware of any vehicle that is problem-free. My co-worker's Lexus RX330 already had two stall issues. That is a much bigger problem than the A/C staying on. You got stranded for THAT. And, yet, he seems to still love his "reliable" Lexus. Go figure.

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