I think I know what this is but wanted to run it by the forum b/c I leave tomorrow for camping 20 miles off the grid. A couple days ago I started to hear a hissing / shishing noise coming from the steering column. Sounds almost like hiss from the radio (but it's not). When the steering wheel is at rest you hear hissing, when you turn slightly left or right the noise changes or stops. There is no affect when I press the brake pedal. Power steering fluid level is fine. I suspect it's a valve issue with the power steering and worse case if that goes out during my trip I can still drive home (like the old days before P/S). Here's the only post I can find on this.