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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 799 (Steering System - General Information - F250-F550) >> Diagnostic Tests >> Steering System >> Inspection and Verification >> Steering System Noise Definitions >> Whistle

Steering System Noise Definitions: Whistle

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Whistle is similar to hiss but is louder and of a higher frequency. It is also more of a pure tone noise than hiss. Whistle is air-borne and is generated by a high flow rate of hydraulic fluid through a small restriction.