I noticed a rather unusual noise coming from (of all places) the steering column: hissing. I heard it the other day when I was in a parking garage and the surrounding area was rather quiet (nobody around, windows up, radio off, etc.). I only hear it when the steering wheel is in motion (rotating)... almost as if there's a mild vacuum leak. The steering pump doesn't make any unusual noises outside of the Jeep, so I'm at a loss. Nothing seems to be malfunctioning; I was just curious what that noise might be.