The check engine light on my 06 Kia Rio5 came on yesterday. I took it to the parts store today and they put the diagnostic tool on it. It said coolant temp sensor. They said they would order one for me. On the way home from there the temp gauge went nearly all the way up. (It was nearly 100 degrees out side.) Would the sensor being bad cause it to overheat, or is this a seperate problem? Is the sensor easily accressable?