Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Mazda CX-9 Heat and Air Conditioning

I am researching the CX9, hoping to buy the Grand Touring in December. I test drove one last week and loved it. I can't remember if there were air registers in the 3rd row. Are there any? If not, has anyone found it a problem? I have 4 children and the 3rd row will be used often. Living in hot South Arkansas, I am afraid the kids will toast back there.


  • We bought a CX-9 a couple of months ago. There are no air ducts in the third row.
    Can't see it being a problem, though, as the A/C is very strong.
  • mdhuttonmdhutton Posts: 195
    When I was a kid, I spent many an hour riding in that rearward-facing jump seat in a Ford Country Squire wagon in August when it was about 108 outside. I learned to deal with it, and I'm sure you're little crumb-crushers will in the 3rd row of your CX-9.
  • cericceric Posts: 1,092
    Actually there are air ducks for the 3rd passengers. They are hidden under the 2nd row seats and are located on the floor. Fold the 2nd row seat down and move them forward to see them. There are two as a pair.
  • maltbmaltb Posts: 3,572
    I'm pretty sure the air ducts under the 2nd row seats are only for heating.

    As far as 3rd row cooling, I have found (actually my kids) that the 3rd row is adequately cooled at outside temps up to 115. We regularly visit the CA/AZ border and I have yet to hear one of mine complain that it's too hot in the back.
  • cericceric Posts: 1,092
    I think you somehow jumped to that conclusion.

    Note that the air ducks below 2nd row seats stop functioning when the air flow is only directed to the upper torso. That might be how you jump to that conclusion.
  • maltbmaltb Posts: 3,572
    umm, ok. Jump, walk or run: I still arrived at my conclusion.

    Perhaps I should have prefaced that with: when in AUTO mode.

    Now that we have that out of the way, let's discuss how effective floor vents are for the perceived cooling of a vehicle. Next time it's 90 degrees outside, manually run your A/C through your floor vents only and let me know how long you last in the vehicle. Cooling through floor vents is plain useless unless you have severe foot sweat (in which case I'd recommend seeing a good doctor). There's a reason the auto mode doesn't route cooling through floor vents.
  • cericceric Posts: 1,092
    AUTO mode automatically determines the best vents to send air, fan speed, etc. When AUTO mode starts to blast with cold air, it usually start with blasting air thru upper vents because it is more effective that way as you said. However, eventually when desired temperature is nearly reached, AUTO mode then sends air thru all vents.

    Again, I have to tested it myself to believe that the floor vents is completely blocked out from cold air. Right now, I have a hard time believing it.
  • cericceric Posts: 1,092
    After some testing, I believe you were right. I stand corrected.
    In AUTO mode, cold air flows thru the upper vent, hot air flows thru the floor vent (which makes sense). For cool air to come out of the floor vents under 2nd row seats, one has to choose the venting mode manually, not AUTO mode.
  • skc7skc7 Posts: 4
    I have a 2008 GT AWD with 13K+ miles. I live in central Ohio and lately because I have not needed A/C I have turned off the A/C, which also appears to turn off (at least the light goes out) the "Auto" mode. However, I have noticed, with the exception of introducing A/C, that the "Auto" mode still appears to work with respect to introducing heat, satisfying temp settings, and controlling where air flow comes out. One phenomena that I have noticed is that after initial startup and within the first two to three miles, the HVAC system momentarily (one second or less) shuts down (fan speed goes to zero), and then returns immediately and continues to operate properly the remaining time you have it on. Has anyone else noticed this phenomena? As long as it always turns right back on, I probably will not do anything about it. However, it is strange.
  • cericceric Posts: 1,092
    When A/C is completely off, all lights on the A/C control panel are off (not just the "Auto"). Correct?
    Recently I have been testing how much MPG I could save by turning off A/C (since the weather is pretty cool, I opened the moonroof). My A/C has been completely silent. I don't recall A/C actions at all.

    You might want to go to the dealer and have it checked out.
    BTW, my experiment showed that you can easily save 1-2mpg with A/C off..... ;)
  • 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.
  • cericceric Posts: 1,092
    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.
  • debbiejaydebbiejay Posts: 5
    Is anyone having an issue with the rear air controller in the 07 touring? If the rear air controller is off, then the rear air is uncontrollable. It blows out at full speed and the front fan control speed does not change the rear fan speed at all. If I adjust the temperature control knob, the rear air fan speed goes higher and lower accordingly. Is this right? Should I have to keep the rear air switch engaged full time to keep the rear air off all the time? Shouldn't the option be, rear air switch off=front controls work all of the air, rear air switch on=rear controls work rear air and front do not. Does this make sense?
  • debbiejaydebbiejay Posts: 5
    I have another issue with the a/c in my 07 touring. Intermittently, the front fan will turn on full blast after the car is turned off. Sometimes keys are out of ignition and in my hand when this happens. I don't have the keyless start option. My dealer says that since this is intermittent they can't fix it until they see it happen. I have seen other posts about this, but would like to know if anyone has had this repaired and what exactly was done to repair it? Thanks!
  • cericceric Posts: 1,092
    Something is not right with your A/C.
    Have your dealer look at it before warranty expires (soon I presumed).
    You could have a faulty switch in the A/C system. :(
  • redbull22redbull22 Posts: 4
    I have the same problem... Same year and model. Well, actually I can't control it at all, the speed is full blast and the temp will not change either. Did you ever solve your problem and if so what was it?
  • debbiejaydebbiejay Posts: 5
    Initially mine was like yours, full blast only. The dealer changed a relay and now the front temp knob is the only control for rear air when rear air switch is off. After checking again with my dealer and poring through the owners manual, I learned that the rear air is now working as designed. Mazda really missed the boat on this one. The front temp knob is the only available control for the rear air when the rear air control is Off. I find this annoying and illogical. But I have learned to leave the rear air switch on at all times.
  • redbull22redbull22 Posts: 4
    Yes, but does it now work when rear control is "on"? Sadly I am 1000miles over warranty.
  • debbiejaydebbiejay Posts: 5
    I'm not sure I understand what you are asking. When the rear control is on, the only way to control the rear air is from the knobs in the back seat. The rear controls have always functioned correctly for me.
  • I have the same issue in my 07 sport. It has only happened twice in 18 mos. I have not mentioned it to the dealer yet but I will next visit. The last time it happened (last week) it took several attempts of turning car on & off to get it to shut off. :confuse:
  • So does anyone have a definate answer and or parts replaced to the mystical "rear air coming on full blast after turning off vehicle myth" I just picked up a used 2007 CX-9 and the day I brought it home (Friday) I turned it off and the rear air blasted on itself, I came back to leave on the car about 15 minutes later and it was off....

    So does anyone have a definate answer? Any Mazda techs out there that have encountered or fixed this issue?

    I am out of warranty so if it just a switch or a relay a part number and location is all I need to purchase it and install it myself. Thanks!
  • Check out the "new member thread" he is a Mazda tech. I asked him, see his reply below

    If you're referring to the blower motor (fan for air coming out of the dash vents--front blower, or fan for air coming out of the vents on back of center console--rear blower), TSB 07-008/09 addresses that issue. If you haven't driven 36,000 miles yet, take your vehicle into your nearest dealer and mention the TSB number listed above.

    However if you're referring to a radiator/condenser fan under the hood, that may run to cool the motor when you turn the car off.
  • Thanks! This is super helpful. My dealer tech seemed baffled since the problem wouldn't happen when the car was with them. Now I have something to go back with since I am still in warranty. Really appreciate your help.
  • cericceric Posts: 1,092
    Dealer has access to electronic versions of TSBs.

    Last time I printed out TSB when I visited my dealer, the service advisor returned it to me and said, "We can find it on our computer."
  • My CX9 is out of warranty so I asked my buddy that works at Riverside Mazda to hook me up with a copy of TSB 07-008/09. I read through it and was very simple and straight forward. I bought the relay that the TSB said to replace (part# G115-67-730) replaced it (under hood relay box closest to the driver's side fender) and up to right now no more occurences.
  • 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.
  • imamgimamg Posts: 136
    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.
  • I have a 2008 CX9 and took my car in today as it was doing the same'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...
  • 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!!
  • cericceric Posts: 1,092
    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. ;)
Sign In or Register to comment.