For Kia cooling system parts of 2012 year of production better don’t repair the radiator. The motor with volume of 1.7 from year 2011 has strict antifreeze temperature. It’s impossible to install in Kia Optima 1.7 radiator with different dimensions. In every Kia Optima it’s important to ensure normal radiator work. If you need to change it in Optima, make sure you buy original size: 490 mm height, 495 mm width and 17 mm depth.
So, with problems of engine cooling in 2013 Kia Optima better buy factory sized radiator: 490 mmX495 mmX17 mm (height, width, depth). Usually in Optima 1.7 especially with motors of D4FD-L code, this part is often changed. In 2013 year cars of Kia it’s important to examine the cooling system.