You're probably better off doing it yourself. It's just tedious, not difficult. Buy a few gallons of distilled water at Wally World if you want to flush it. Just fill it with distilled water, bring it up to temp, and drain it two or three times. Whatever is left in the system after than will be trivial. About 3.25 quarts plus the water in the engine will bring you to 50 percent.I truly would rather pay someone to do this but I cannot find someone to pay WHILE I SUPERVISE, with scrutiny
It's a catch 22. Like everything.
Also, the KIA OEM coolant has no silicates in it, probably for a reason. I plan on using it when I do my '16.