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SUVs Mazda CX-9 CX-9 Ventilation Problems
10 messages, Last post on Mar 22, 2008 at 3:34 PM
You are in the Mazda CX-9 Forum. Your Hosts are steve_ & tidester
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I purchased my CX-9 end of January and in general I have really enjoyed it so far. However, I did find some issues with the ventilation system: 1. Even when it is off, I can still feel draft coming in especially when I have configured it to blow through the four vents. 2. I cannot independently shut off any of the four vents; I can only change the direction from left to right, from up to down. 3. The recirculate button sometimes does not work. I pressed on it and it did not beep, nor did it lit up. 4. Awful mildew smell after the A/C has been turned off. Did anyone notice similar issues? I have about 2000 miles on the vehicle so far.
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Replying to: 16ue (Mar 10, 2008 11:01 pm) 2) You can only shut off the two outside vents. the center vents are always active in "face" mode. 3) See your dealer. 4) This is typical, especially in humid climates. The evaporator, when the A/C is on, will dry out the air and eliminate the musty smell. When the A/C is switched off, the evaporator will need to be completely dried out which can take some time. |
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Replying to: 16ue (Mar 10, 2008 11:01 pm) One way to make sure that doesn't happen is to turn off the AC a minute or two before you will shut off the car, and just blow in some outside air during that minute or two (at full blast, if you can). This will get rid of the moist, humid air in the vents and reduce mildew formation. |
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Replying to: nxs138 (Mar 11, 2008 1:04 pm) One way to make sure that doesn't happen is to turn off the AC a minute or two before you will shut off the car, and just blow in some outside air during that minute or two (at full blast, if you can). This will get rid of the moist, humid air in the vents and reduce mildew formation. Really?? Can you explain? This seems contrary to my way of thinking - if you have the AC on because it's warm and humid out, the AC will work to cool and dry out the air - the air in the vent system. By turning it off and allowing outside air in, aren't you then introducing the warm humid air into the ventilation system? |
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Replying to: pulleydog (Mar 14, 2008 4:24 am) wwest, "Ford Escape Mazda Tribute Maintenance and Repair" #1705, 8 Aug 2002 10:55 am Part two of that post talks about opening the windows.
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Replying to: steve_ (Mar 14, 2008 8:21 am) |
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Replying to: pulleydog (Mar 14, 2008 4:24 am) If you turn on the blower immediately after shutting off the AC, you are indeed introducting humid air into the vents, which might form into dew. However, with a constant flow of air this dew should mostly evaporate, especially since you are now bringing the ductwork to the same ambient temperature as outside. So it's the constant flow of air that's important. I was once told to leave it on full blast for 2 minutes with the windows cracked a bit once you have parked the car, but I'm usually too lazy to leave it on that long...
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Replying to: nxs138 (Mar 14, 2008 4:58 pm) 
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Replying to: nxs138 (Mar 14, 2008 4:58 pm) Hopefully this doesn't sound dumb, but when it is warm and humid out, would it be more advantageous to run the A/C on HOT, instead of turning the A/C off altogether and running the fan to introduce outside humid air? I'm wondering if adopting your thought process of running the ventilation system for a period of several minutes for the purpose of minimizing condensation in the vents could be accelerated by continuing to run the A/C (which would be low in humidity) but switching it from Cold/Cool to Hot/Warm would acclimate the ventilation system and prevent or minimize condensation as originally intended.... but perhaps only needing to run it for say, 30 seconds.....?? Since you mentioned being "too lazy" to leave it on that long - I think most of us are just as impatient and those 2 minutes might seem like 10, so we probably wouldn't be apt to do what we should be doing to minimize the effects of this.....but maybe the "30-second method" would work??? Just a thought....feel free to blow my lame theory out of the water! 
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Replying to: pulleydog (Mar 20, 2008 5:48 pm) What I do is 1 minute or so before I get home, I just turn off the AC and turn up the fan speed while cracking a window. The window cracking is important I think since you will initially feel the air getting moist as it reaches ambient, and you don't want all that hanging around in the car. I've had my car 7 years now, living in southern Indiana for 2 summers, then Charlotte, and never had that mildew smell. So either my little system works, or either Audi designed a HVAC system that doesn't mildew up (and I doubt that, since everything else on the car seems to break!) |
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