[s-cars] steering hissing

[kristy]

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I have a 1994 S4, I hear a hissing noise coming from the steering collum ri=
ght next to the servotronic valve.  The hissing stops when I turn the wheel=
 a little or alot either left or right.  I have disconted the servotronic v=
alve and the steering assisst is decreased, so I know the servotronic valve=
 works, but the hissing continues.  I had the dealer look at it and he said=
 some make the noise and some dont.  I had him replace the o-rings in the s=
ervotronic valve but no luck. I know the hissing is the loadest coming from=
 the inlet to the steering system, but can not figure out what is going on.
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