I was the ex owner of sonata yf 2011. Decided to trade off last yr nov.

The aircon not blowing cold air is normal due to cbu from korea wth heater & the sunroof absorbed too much heat. U need atleast 10-15min in order to cool down the temp esp if the car parked under the sun or even in super warm days. Nothing really wrong unless after 20-15min still hot.

I resolved this by adding 2nd layer of tinted glass on top of ori tinted!  The car cooled after 5 min thereafter.

Not much problem wth this car actually except irritating sound from the sunroof mechanical parts & also the doors' covers sound.