Hi all, I have suddenly developed a weird rumbling sound coming just behind the dashboard steering wheel (not the engine). its disappears when driving but as soon as i am idle I can hear it. This is not all, when stopped & engine on & I turn the steering wheel to the left or right, it has started to give a juddering rumbling sound. I have checked to see if there is enough PAS fluid & there is. Could it be PAS pump or something else ? I have an Audi A3 TDI 130 2002. Any advice would be appreciated.