My girlfriends dad has an 05 kia sadona , receantly it has started overheating. It overheats while driving then when you stop it will start to cool. Then it will off and onv heat up and cool it does this aloso while driving. If you zit still a while it will overheat but if you race the engine to approximately 3000 Rome it cool and stay at a normal temperature . I have changed the thermostat and for some reason I feel like the cooling fan (hi) isn't running as high as it should.