I have two questions. One my Low Coolant light is on but I have checked the level over and over and it is where it needs to be. What is the cause of this and how do I repair it myself. Also, my doors have automatic locks and they have stopped working. My remote keyless entry will not open them. Nor does the lock / unlock button work. I can see them trying to work but they just dont. What could be causing this and again how do I repair it myself?