This sounds exactly like the problem I had with my '07 2.0 tdci. A high-pitched whine that only stops when you're stationery for a short while, and starts up again as soon as you give some steering input. The Ford dealer we bought the car from, and the different Ford dealer we took it back to for investigation both said the same thing that's been quoted above - the noise is an electric motor that drives the power steering pump and that's that. Tough. Cars make noise, just live with it. I've never heard a car make such a loud noise from such an integral component, so I pressed them and had the car checked by an independent mechanic who agreed with me that the noise was unacceptably loud. He also suggested that the cause of the noise wasn't the motor itself, but a vibration in the pipes caused by the motion of the fluid through the pipes at a pinch point. After a lot of arguing with the Ford dealers - and having almost reached the point of going down the route of "rejecting the goods" - they finally found something in their technical system that some of the pipework for the power steering on the early models of this car had been completely redesigned, and that this might fix the problem. Sure enough after a day in the workshop having the new pipes installed the noise went away. Ford themselves never acknowledged that the pipes were the cause of the noise, or even that the noise was unacceptable, but they did the job under warranty for us. This is probably too late for Boldeagle, but I've posted it in the hope that others might benefit from it in the future.
