If it is what I think you are talking about, then my van does that too. It makes kind of a farting noise when the wheels are cranked far to either side... If this is the case, it is nothing to worry about. It is just a noise that seems to come from the pump, and really doesn't do any harm. People might look at you weird when you turn sharply, that's about it. This has been going on in my van for nearly 3 years now without incedent, and it apparently did the same thing for the owner before me too. Even my dad's truck, which he has had since 1995, makes a weird noise from the power steering pump, and it has not malfunctioned at all yet.