Anyhow this is some motorized component and a PITA to swap on almost any car. You're going to have to find a service manual and decide if you want to go there.
I have a 2011 Hyundai sonata,
I suspect the outside fresh air flap is non-functional.
I regularly experience fogging even though the fresh air-vent is open + A/C on.
With the A/C on + fresh air vent open and directed to the windows, only a very small portion of fog gets cleared. During the winter it is so bad that the fog freezes up turns into ice, I have to store a mini ice-scraper in the glove box for this very purpose.
I'd like to get this fixed asap. whenever I take it to the mechanic they keep trying to teach me how to operate the vent to clear the fog. i already know this!, I'm tired of trying to explain i want to just fix it myself.
FYI I own 2 cars, this is the only one with the fogging issue.
I am highly confident the culprit is the re-circulation flap/valve system non functioning, its either the motor or the valve itself. I want to just find out where this flap would be located in order to verify. I tried searching online with no success.