Please help,i have just bought myself this focus which has done 55000 miles and i am very happy with apart from one thing. The engine temp gauge fluctuates between cold and just below the warm reading. It never goes past the middle but sometimes just goes back to cold and stays there. This happens on long runs on motorways as well as driving round town. I find myself watching the gauge more than the road and it is becoming very annoying. Any help would be greatly appreciated.