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Genesis Forum: Auto defog is not a great system (G90).
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  1. #1
    Mike734 is offline Getting familiar with the group... What I drive: Genesis G90
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    Default Auto defog is not a great system (G90).

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    I have noticed that when I leave my AC system in Auto it spends a lot of time with the front defog setting on (the little auto defog icon can be seen below the map). That means the air distribution is constantly being directed to the front windscreen when it should be sent to the floor for heating and the front vents for cooling.

    I read the manual and it mentioned that the "Auto Defog" system might not work properly in temperatures less than 50 degrees F and that it can be disabled by pushing and holding the front defog button for three seconds. The yellow light will flash and the system will be disabled.

    Fifty degrees? really? That seems ridiculous. I live in the Seattle area. It is less than 50 degrees seven months a year and even at night in the summer. That is not a great operating range. So now I run with the system disabled which works OK except that I have to push the defog button when it's cold and raining just like older cars. This situation is not acceptable for a car that aspires to be in the class of Mercedes, BMW and Lexus.

    My Acura from 2006 handled air conditioning better. In auto, the AC system is always on thereby drying the air entering the cabin. Although this probably had a negative effect on gas mileage, the cabin air was dryer and fogging was generally not a problem. In severe conditions I put the defog switch on manually (just like I have to do now) and cleared the window. It appears that the engineers at Genesis have decided to forgo a better system in favor of better mileage. By the way, I can simulate the Acura system in the G90 by manually selecting AC "ON" when in auto mode. This does dry the air a little and delays having to manually select the defog button.

    Does this match anyone else's experience?


  2. #2
    EdP is offline Supporting Member What I drive: G80 AWD Ultimate Adriatic Blue
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    Default Re: Auto defog is not a great system (G90).

    I don't live in Seattle so I don't know your weather aside from a lot of rain. Has it always operated that way? Is it something that has changed since new? My only thought is that if it has changed perhaps something like a clogged cabin filter would affect it. I'm on the other coast and defrost does not go on very often here.

  3. #3
    Mike734 is offline Getting familiar with the group... What I drive: Genesis G90
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    Default Re: Auto defog is not a great system (G90).

    Quote Originally Posted by EdP View Post
    I don't live in Seattle so I don't know your weather aside from a lot of rain. Has it always operated that way? Is it something that has changed since new? My only thought is that if it has changed perhaps something like a clogged cabin filter would affect it. I'm on the other coast and defrost does not go on very often here.
    I've only owned this car for one month so there shouldn't be any clogged filter problems. I imagine the problem stem from cooler air always being a little more humid than warmer air. I'm thinking the algorithm used to determine when to turn on the defog system is flawed, hence the warning that it doesn't work well below 50 degrees.

  4. #4
    Riley2323 is offline Been here awhile... What I drive: 2017 G90 Ultimate, Caspian Black
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    Default Re: Auto defog is not a great system (G90).

    In the Northeast as well. I have yet to see fogged up windows. I use the defrost button periodically depending what is on the exterior of the windshield.

    You seem to be jumping to the most complicated conclusion for a solution and bypassing some of the most obvious.

    Not saying you are wrong, but it is just a matter of getting the right balance of temperatures or humidity to eliminate the problem. It is sort of a triangle of humidity, and interior temp being appreciably different than exterior temp, remove anyone of the legs of the triangle and the problem is solved.

    Have you tried cleaning the interior windshield? I had my car serviced at the Hyundai dealership and it was spotless when returned, but the cloth they used on the interior windows had something on it and it left a god awful chalky residue. Thinking it was polish. That caused perceived foggy issues for me during a rainy stretch and until I mustered up the energy to clean them. The new materials can give off fumes too.

    I think the dealership checking on filters is a good idea too.

    Recirculation button working properly? It should be pulling in fresh air for defogging.

    And what about just using auto climate? I rarely mess with anything other than the temperature and I know in the autumn it gets funky with humidity and strange temperatures in certain parts of the day.

  5. #5
    Mike Frantz is offline Getting familiar with the group... What I drive: Genesis G90
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    Default Re: Auto defog is not a great system (G90).

    I live in the Seattle area and also have had issues with fog that I never did with BMWs and Audis.

    Most noticeable with passengers when crossing the mountains (cold and rainy/snowy).

    I keep it in Auto always but the fog gets thick enough especially in the bottom front corners of the door windows and base of the windshield.

    Is it a regional thing? When I first moved here as a college student in 1989, my first cars lacked a/c. I realized I needed it not to stave off summer heat (usually below 80 degrees and low humidity) but to be able to see with the windows rolled up from October thru June.

  6. #6
    EdP is offline Supporting Member What I drive: G80 AWD Ultimate Adriatic Blue
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    Default Re: Auto defog is not a great system (G90).

    Quote Originally Posted by Mike Frantz View Post
    I live in the Seattle area and also have had issues with fog
    Is it a regional thing?
    Seattle is wetter than most places. The average humidity in in the top category at 73. Atlanta is 68, Las Vegas is 30. Other factors come into play on a windshield though, temperature, temperature changes. air movement.

  7. #7
    Riley2323 is offline Been here awhile... What I drive: 2017 G90 Ultimate, Caspian Black
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    Default Re: Auto defog is not a great system (G90).

    As they have engine warmers for Aslaska, MN, ND and Montana and a few other states, sounds like they need a NWest Package/program as Mike stated. They moved the Gas station data from the the Sirius controls to the home page on the dash, I am sure they could make a Rain Forest climate control setting toggle; if you hit the right person at the company.

    Or maybe it is just as simple as switching out the interior sensor for a humid environment sensor.

  8. #8
    Mike Frantz is offline Getting familiar with the group... What I drive: Genesis G90
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    Default Re: Auto defog is not a great system (G90).

    Or I should just move :-)

    While I share Mike734ís experience in getting fog while on Auto, Iíd say for me itís only been a handful of times in 8500 miles. It obscured enough that I took action to clear it, and found it odd that Auto wouldnít prevent it.

    Each time it was below 40dF, raining of course, and I had 2 passengers on a long trip.

  9. #9
    Mike734 is offline Getting familiar with the group... What I drive: Genesis G90
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    Default Re: Auto defog is not a great system (G90).

    I want to emphasize that Iím speaking of two different ďAutoĒ systems. The auto button that make the entire AC system run automatically and the auto defog system. They are separate. The defog can be set to operate manually or automatically via the defog button. Hold it for three seconds to switch back and forth.

    When mine is running automatically it offen turns on probably based on some sort of humidity sensor. The trouble with that is, very often that means the heating I expect from floor vents is directed to the windshield instead when not in fogging conditions. When I read the manual it said that the system may not work properly when ambient temperatures are below 50į F. We are often at or below 50į here in Seattle. Therefore I have set it to run manually. I have to turn it on.

    In my Acura, when I push defog, the AC came on. I think most cars are the same. Turn defog on, the AC compressor come on. This does not seem to be the case in the G90. I have to also push the AC button. Seems wrong and a design oversight to me.

    Iím hopping that later this spring and summer I can return to fully automatic but Iím doubting it based on the normal temperatures around here.

  10. #10
    EdP is offline Supporting Member What I drive: G80 AWD Ultimate Adriatic Blue
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    Default Re: Auto defog is not a great system (G90).

    Quote Originally Posted by Mike734 View Post
    In my Acura, when I push defog, the AC came on. I think most cars are the same. Turn defog on, the AC compressor come on. This does not seem to be the case in the G90. I have to also push the AC button. Seems wrong and a design oversight to me.
    You may have to pop the hood to see if the compressor is engaged, but having the AC run with defog is 40 year old technology. May be worth having the dealer check it out.

  11. #11
    Mike734 is offline Getting familiar with the group... What I drive: Genesis G90
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    Default Re: Auto defog is not a great system (G90).

    Quote Originally Posted by EdP View Post
    You may have to pop the hood to see if the compressor is engaged, but having the AC run with defog is 40 year old technology. May be worth having the dealer check it out.
    Are you suggesting that your compressor DOES come on when you push defog?

  12. #12
    EdP is offline Supporting Member What I drive: G80 AWD Ultimate Adriatic Blue
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    Default Re: Auto defog is not a great system (G90).

    Quote Originally Posted by Mike734 View Post
    Are you suggesting that your compressor DOES come on when you push defog?
    Not just suggesting, the manual says it does. Mine has worked well, but my climate is less severe with rain than yours.
    This is from the G80 manual:

    Auto defogging reduces the probability
    of fogging up the inside of the
    windshield by automatically sensing
    the moisture on the inside of the
    windshield.
    The auto defogging system operates
    when the heater or air conditioning is
    on.

    If more moisture is in the vehicle, the
    automated steps operate as follows:
    Step 1 : Operating the air conditioning
    Step 2 : Outside air position
    Step 3 : Blowing air toward the windshield
    Step 4 : Increasing air flow toward
    the windshield

  13. #13
    Mike734 is offline Getting familiar with the group... What I drive: Genesis G90
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    Default Re: Auto defog is not a great system (G90).

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    I donít see that in the manual. Iíll look again. It should. But then I disabled the auto function and that might have disabled that aspect of the system.

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