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.
Is this happening when you are starting it cold - or is it happening all the time? This was in the other thread you posted in:
Originally Posted by Mongo
There are tiny pilot valves in the power steering rack, they can make noise, that's the typical start on a cold morning, hiss/moan that come from the PS rack. So yea something could be wrong with the rack.
The hydraulic fan is controlled by the PCM, if you don't need it on, it won't turn on. I've seen posts about these going bad.
has not been around on the forum lately and Tim the OP, has not been on the forum since June of 2015. Maybe @Flex
or one of our other resident mechanics can chime in here.
I'd say that if you are not losing fluid and it doesn't seem to be having any kind of negative effect on your steering, I wouldn't be overly concerned about anything happening on your camping trip. You might want to bring an extra pint of power steering fluid with you - just in case.
Also, Tim mentioned that his power steering fluid was getting very hot, very quickly - have you checked to see if you have that same symptom?
If you do, I'd guess that your Hydraulic fan has failed and the extreme temperature that your power steering fluid is heating up to is causing a pressure build-up which is probably being forced out of one of those pilot valves in the power steering rack that @Mongo
mentioned - causing the hissing noise that you're hearing.
Of course, this is all just speculation on my part - but it makes sense IF
you have that same symptom of your power steering fluid getting hot very quickly.