My I20 is two years old ,there is one issue i observed that even when AC and Blower is off,stll sometimes air blows out of vents in the cabin.
Have anybody experience similar issue.
There is one switch, which allowing to outside air to come inside cabin. Its called air circulation mode. If it might be left to turned on, So you can get air inside of the cabin even AC off. When AC turned on it mixing up outside air and AC cold air. and throwing mixed air in cabin by blower/AC vent