look under your car while the ac is runnung,you should see condensation water dripping from the hole in the firewall,if its blocked you will get excessive water build up in the evap,you will hear the water spinning around when vent is on high,you may even get a mist blowing out of vents,it sounds to me that everything is fine,your ac is blowing so cold that like a cold glass of water on a hot humid day,it sweats on the glass dripping,i think your vents are just building up condensation,if it gets worse check make sure all the water is dripping from the check valve under the car,if your hot noticing water spots on the ground on a very hot dasy after running the ac for about 20 mins,the drainage may be blocked.its good idea to find it,place your finger in it work away any road debris and clean it out.you may notice after wiggling it around that allot of wwater drains out,this is a good thing,it means it was clogged.