hi.
Well I wouldnt say they overheat, but the for some reason the 04+ cars like to run alot hotter than the previous years. I am not sure if the size of the coolers were made smaller or weather the sensors on the newer models like to read weird.
From what I hear the 04+ cars run around 220-230 temp after completely warmed up. Which isnt that hot, but that temp should be right around 200º for perfect temp and fluid life. Because the coolers on the rad it should be right at what the coolant is running. I havent heard of a transmission failing yet because of how warm they run, but just know at 225º or higher the fluid life is cut down a ton to maybe even half its normal life.