The tanks on the sides (right side in my case) leak where they crimp the plastic tank to the aluminium radiator. I had to put UV dye in cooling system for them to find the leak. If you put dye in make sure it's for coolant not oil I got it at napa . The chaine stores only had the dye for oil.There are some old post on this problem some blew the tanks off resulting in a tow truck ride.what was wrong with the radiator? I have a 2015 also and smell coolant every so often,,,dealer pressure tested both Intercooler and radiator and said they both passed!