Does anyone watch their engine coolant temperature gauge? When at operating temperature mine sits at four bars but recently something strange is happening and even when warmed up it sits between two and three. It can also jump around between two and four. This has never happened before. Previously it has always been rock steady at four bars. I have not changed my driving style nor conditions. The car still drives normally however other than a light rattle at times at low speeds like something is loose in the exhaust/manifold. It has done 45k miles and was serviced last January at my local Ford garage.