There is a noisy relief valve in the hydraulic pump.
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| • | Noise is evident in all power steering systems. |
| • | Hissing is a common noise. The hissing noise 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 it is 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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