I have been having some issues with my power steering. Ever since the teperature has been dropping my car has been making some noisy humming sounds whenever I turn the wheel. It is really driving me crazy. It seems like it is fine in the morning when I leave the garage, but after its been outside in the cold all day, it makes these noises on the way home. Anyboby else have anything like this happen to them? Help PLEASE!

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1997 E420 Black Opal

"Why do I have to be Mr Pink"?