There is a noisy relief valve in the hydraulic
pump.
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| • | There is some noise in all power steering systems. |
| • | One of the most common is a hissing sound. The hissing sound
is most evident at standstill parking. A hiss is a high frequency noise. |
| • | The noise is present in every valve and results from a high velocity
fluid passing over the valve orifice edges. There is not a relationship between
the hissing noise and the performance of the steering. A hiss may
be expected when the steering wheel is at the end of travel or
when slowly turning at a standstill. |
| • | Do not replace the valve unless the hiss is extremely objectionable.
A replacement valve will also exhibit some slight noise and is not always
a cure for the objection. |
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