I have a 2000 ML320, with 107K miles. I believe that my power stearing pump has gone bad. The car drove fine, but a very load noise came from the pump, or so I thought. However, I replaced the pump, but the noise did not go away. Do you think this pump may also be bad, or is there something else that could be making the noise in the stearing rack. The car drives fine, no problems turning, but the noise gets loader when I turn.