I have just purchased a 2002 Discovery ES TD5 with A.C.E and have noticed a low resonating noise while turning the steering. It is more noticeable while turning right but it is also present while turning left but not as loud. I have heard that the ACE pumps can make a bit of noise but this noise is there even at low speed. The steering function is fine but I would obviously rather this noise not be there. It is still under warranty but I would like to here a bit of feedback before I take it back.