Hi I have had my temperature sensor replaced twice already now my car has started doing something funny. The temperature gauge is going up and down when I drive to the point it's in the red and the engine stop light is coming on for a few seconds then going off and the gauge goes down again. Now this is worse on the Motorway which is strange. If I have the hot air on full blast it stops it from going into the red but it still moves up and down. Oo I've got a 2008 207 1.4 sports. Does anyone have any idea what could be causing this?