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2006
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Focus ZX5 SE, Standard
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Repair and Diagnosis
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OEM General Information
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Noise, Vibration & Harshness
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Description And Operation
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Noise, Vibration and Harshness (NVH)
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Glossary of Terms
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Hum
Glossary of Terms: Hum
Mid-frequency (200-800 Hz) steady sound, like a small fan motor. Also described as a howl.