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Hyundai Sonata Climate Control Questions

whisper1whisper1 Posts: 50
Just got a fully load 07 Sonata. I cannot confirm this due to weather is still cool.

I pushed the "AUTO" round knob to run automatic climate control. Does the LCD show AC or the AC button lit when the system decided to run the AC. How to tell the AC is on?

In manual mode, AC comes on if temperature dial is cranked below 17C (I think ?) or by pressing the AC button; in both cases, the LCD show "AC".


  • drdonrsdrdonrs Posts: 164
    I have an 06 LX6 and I believe the automatic climate control works the same in my 06 as it does in your 07.
    1. With AUTO on the temp. is set by you and the AC will be on automatically. You will see that it pulls moisture out of the cabin so no fogging of the windows.
    2. Push the AC button and the AUTO is off and your AC is on and temp. is controlled in the same manner as above.
    3. Push AC button and it will turn off completely and your compressor will NOT be on.
    It's a little crazy but that's the way it is set up to work. I'm used to it and it works the same way in my 06 Azera Limited. In the summer here in NY I keep it on AUTO all the time and the compressor will cycle and keep the air comfortable and at the same temperature.
    Hope this explains it and that it makes sense. Good luck with your Sonata. It's a really neat car. ;)
  • whisper1whisper1 Posts: 50
    #2 "temp. is controlled in the same manner as above", strange even with AUTO offline.

    For the pass 4 days, I was sure the air cond was on, but no indication except the cool air, there goes the gas mileage :mad: . I pressed some buttons today and the behavior is now as expected. Too bad I forget what I pressed to get into this behavior and worst forget the steps to fixed it :mad:
  • rick2456rick2456 Posts: 320
    The above is why I got the SE instead of the limited. I find automatic climate control to be a pain in the butt. I much prefer the simpler manual controls instead of fooling with temp settings, etc to try to get the car to put out the kind of air I want at that particular time. Some like it, but I consider it a step backwards in vehicle comfort.
  • targettuningtargettuning Posts: 1,371
    I am one who likes it and what could be more simple..set the display for, say, 72 degrees and it will keep about that temp year round. Heat in the winter, nothing added in the spring (not cold AC air nor heat unless required by outside temps)and COLD air when it is 85 or 90 degrees outside. I am always fumbling and fiddling and tweaking the knobs with manually controlled AC...too cold, not cold enough, something in between..
  • whisper1whisper1 Posts: 50
    It is a very good feature, I like it.

    I have a habit to switch off AC and let the fan run a minute prior park to remove some moisture on the condenser. This is way too complicate for the wife to follow when in auto mode.

    I think something is missing in the climate control software. Everything on the climate system in auto mode have an indicator, except AC in auto mode. Ideally the AC indicator should follow the compressor relay in any mode.

    Interesting question:

    #1 The climate system doesn’t have a heat only or cool only switch in auto mode, in the event that the setpoint temperature is met, what does the climate system do, for example in summer ? I can think of two scenario.

    a) Switch off AC, keep fan running; temperature buildup then switch on AC.
    b) Switch off AC, keep fan running, turn on heater; temperature buildup then switch off heater and switch on AC. I hope this is not the case!

    #2 The same question for winter.

    #3 How does the logic work when ambient is at the borderline like in fall and spring.
  • targettuningtargettuning Posts: 1,371
    In regard to your "setpoint met" scenario in summer I believe the system keeps on running as usual because the setpoint is never truly met. Interior temperature is a fluid thing in the summer (well, in the winter too) because a car interior is not well insulated, has large glass areas that admit sunlight, bleed a small but definite amount of engine/exhaust heat into the interior. So the HVAC systems job is never done. In borderline situations there is a probable "off" cycle for the compressor until heat eventually builds to the set or desired temp. due to all the area etc.
  • joshqcjoshqc Posts: 1
    i need help with my A/C. I recently changed the compressor because it stopped working and i went to a mechanic who found there was a leak in the compressor. but after the replacement i found the A/C is not as cold as before by saying that i mean i dont feel cold air but kind of "cool" air instead. I went back to the mechanic again thinking maybe there was not enough freon. And they checked and recharged the A/C but it is still the same. Now it's driving me crazy.
    So what could be the possibility of this kind of problem? I dont want to go back to the same mechanic again because apparently he cant do any better. Your help would be really appreciated. thanks!
  • skeeter6skeeter6 Posts: 10
    The air quality control system on my Sonata , which is a part of the 2006 Sonata LX Auto Air Conditioning, has become very inconsistent It operated as describe in the manual for the first 10 months now will not switch to inside air when exposed to exaust fumes. Has anyone had this problem? My dealer has no idea on how to fix it. Hyundai has not help!
  • cabbycabby Posts: 8
    I also have a Limited, and have found the climate control a bit confusing. I have been using the manual fan (did not press the A/C button) and inside of the car gets VERY cool...pretty sure the A/C is turned on even though it is not lit on the LCD. Confusing...
  • craigbrookscraigbrooks Posts: 420
    There have been comments on how to "shut" off the auto AC but I can't remember exactly how it was done. I think you hold your arm out the window while hitting the panic button on the remote and trying to open the trunk at the same get the jist. It can be done but is confusing. My 06 GLS has AC "on" and AC "off" quite simple. I like that.
  • whisper1whisper1 Posts: 50
    If the Auto knob is pushed, the LCD displays "AUTO". Fan speed, recirculation, AC are controlled automatically. Activate any of these controls forces only that control to operate in manual mode. Ex: with LCD shown "AUTO", AC is ON as needed. Push the AC button, AC is always ON; push it again, AC is always OFF.

    Yeah, it is a bit confusing.
  • skeeter6skeeter6 Posts: 10
    There are several comments about the Sonata LX a/c climate control; however, I have not seen any discussions on the air quality control system which is a part of the auto air conditioning system. If you read the owner's manual for the 2006 model, page 109, and for the 2007 model, page 111, you will see that the AQS should only automatically switch to recirculating inside air in the presence of exhaust gas (or heavy smog). It should not randomly switch to recirculating when no exhaust gas is present.

    Other inconsistencies which Hyundai Motor America claims to be "normal" that we and the regional service manager have experienced is as follows: At times, the system doesn't switch over to recirculating in the presence of exhaust gas; at other times it randomly recirculates for no reason at all and will stay on reciruclating for several miles; often switches to recirculating when going under freeway underpasses; and our Sonata and a test drive by the dealer's service manager of a 2007 model both always switched when entering a garage. I could go on and on with many more incidences.

    My 2006 Sonata performed perfectly for ten months, then became erratic, recirculating 80% of the time. The dealer replaced the sensor which slowed down the reciruclating but has not resolved the problem. Hyundai claims that the random recirculation is normal regardless of what the owner's manual says.

    The dealer's service manager, after test driving two 2007 models, has experienced these inconsistencies and states that he doesn't understand the purpose of the system, since it does not perform as described in the owner's manual. Hyundai refuses to admit to any problem, and we are heading toward arbitration. Also, I am preparing two complaints to be filed with the State Attorney General's office over this issue and the sloshing fuel tank.

    I urge you to read your owner's manual and observe how your AQS system is operating. By the way, the air quality in this part of our state is relatively free of smog, so the system should not be recirculating unless it's exposed to exhaust gas.
  • cabbycabby Posts: 8
    Ok, but how about when auto is NOT pushed at all and you just want to use the manual fan (without the AC). You will notice that the air coming from the vent is indeed AC not just a fan, but the "AC" will not be shown on the LCD. On rare occasions, just the fan will come out and you can tell this difference from the AC air.
  • cabbycabby Posts: 8
    Where do you live? I live in San Diego and the recirculation mode is on about 70-80% of time using the "A" button.
  • skeeter6skeeter6 Posts: 10
    We live in So. Arizona. Your AQS should not be running 70 - 80 % of the time in San Diego. We are very familar with San Diego used to live in So. Calif. befor retiring. Take your owners manual and go to your dealer and ask him to explain why. Hyundai claims I am the only one complaining.
  • whisper1whisper1 Posts: 50
    I had exactly the same issue during the first few days.

    Because it was on Auto, you activated one of those 3 controls (see my earlier reply) to gain manual control (just for this control, ex: fan speed), the Auto text is no longer displayed on the LCD, BUT, the other 2 controls (AC and recirculation) are still in Auto.

    It remembers the setting on next engine restart. In this example, no Auto message on the LCD, but AC and recirculation are still in Auto mode.

    Just press the Auto knob to put the system into a known state, which is auto. Or shut it off and do not activate the Auto mode, manually activate the desired controls.
  • whisper1whisper1 Posts: 50
    The sensor was probably detected fumes which were harmful but odorless.
  • skeeter6skeeter6 Posts: 10
    Then why at times will the AQS not go to recirculation when diesel fumes enter the cabin and are so strong we have to manually switch. My wife is chronic asmatic and the concept of the AQS was the determining factor in our purchase of the sonata
  • craigbrookscraigbrooks Posts: 420
    "If the Auto knob is pushed, the LCD displays "AUTO". Fan speed, recirculation, AC are controlled automatically. Activate any of these controls forces only that control to operate in manual mode. Ex: with LCD shown "AUTO", AC is ON as needed. Push the AC button, AC is always ON; push it again, AC is always OFF. "

    Now that sounds easy. Where was I?
  • targettuningtargettuning Posts: 1,371
    I guess I will preface my comments with the following facts:
    1. I don't currently own a Sonata with this feature.

    2.I don't really know how it actually functions (from a technical standpoint) so I don't know what "triggers" it to automatically use recirculate mode. I am assuming it is some type of sensor but what exactly does this sensor have to sense??? What components in "smog" or exhaust gasses does it need to see?
    If yours seems to have worked automatically for a long time frame I guess it does work. So, with these provisions out of the way my comments then:
    You don't see any discussion of this feature because it isn't of great concern to most who post here. It either works unobserved or doesn't and most don't care.
    I understand your special circumstances (wifes illness or circumstance) but guess have had (for years and years)a switch or button that can switch between recirculated air and outside air. If you detect something she doesn't like in the form of an odor or particular substance simply reach over and manually make the change to recirculate then when the crisis passes change back to fresh or outside air. Problem solved WITHOUT yet another lawsuit or arbitration trail. Yeah, I understand because Hyundai states it (this feature) exists it should work but whatever sensor drives the system apparently isn't ready for prime time. For my part this feature would be one of those "nice but never used" things like "Shiftronic". Admittedly none in our family has a breathing problem but I have NEVER switched to recirculate mode on ANY of our AC equipped cars for any reason.
    As for the "gas sloshing" problem?? I personally feel you are much too picky and much too quick to file legal recourse for non-problems (in the case of gas slosh) to minor annoyances (auto recirculate) in as much as this can be accomplishes manually.
    This is simply my take on your commentary. In the meantime I will try to educate myself on how this system works.
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