Sorry to hear it's a leak, hopefully it something simple and not the evaporator, just a word of warning, if it turns out to be the evaporator it's going to be expensive just to replace that $100 part, it is buried deep with the dash and the entire dash has to be disassembled all the way to the firewall to get to it, if you have to get that done go ahead and also replace the heater core which is within the same enclosure in case it goes bad somewhere down the road and it all has the be remove again to replace the heater core, and make sure whoever does the job really knows what they're doing or there could many issues afterwards if everything is not put back together correctly, we're talking wiring harnesses, AC duct work and controls and lots more, make sure they label everything and take lot of photos before and as they're taking everything apart!!

Not trying to scare you but figure you should be prepared for the worst, here's a link to webpage where they replace the evaporator on a 2007 Kia Sportage, when you get close to the ends of the article you will see there nothing where the dash was except the metal firewall.

How to Replace the AC Evaporator on a 2007 Kia Sportage | AxleAddict

Why auto engineers can't figure out how to build these AC systems so you wouldn't have to do that much works simply to replace a $100 part I'll never know!!