Hi was driveing on the motorway when i noticed lots of smoke comeing out from under the bonet.When i looked under bonet the power steering pump had lost all its fluid out the cap. So I let it cool down as the engine and the fluid was very hot and toped the fluid back up to its level. By the time I got the car home it did the same again but there are no leaks around the pump or the tank but the pump makes a small wine now.