Ok I'm trying to fix my sisters 01 KIA sportage. She was drving down the interstate the temp gauge started going up. She said it was a hot day she had the air on. Temp went farther up. So she turned the heat on, the temp diddent go down pulled over to get off the interstate an it died. Wouldent start back up changed everything I could think of finally got it started and now it won't go outta 2nd gear, the temp gauge is fine but after I drive it for about 15 mins it dies again an won't start. As if its getting hott cause after about 20 mins. It'll start fine. But it wont go outta 2nd gear and dies after bout 15 mins. Imma take the cat. Converter and clean it out very good. But I doubt ill do any good. Can anyone please help me?