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Some 2007-2008 Mercury Mountaineer vehicles equipped with a 5.4L engine may exhibit a Front End Accessory Drive (FEAD)-related high pitch metallic whistle/hoot noise after a cold soak in ambient temperatures below 40 degrees Fahrenheit.

This noise may be caused by the grooved nylon FEAD idler pulley.

Replace the nylon idler pulley with P/N 6L3Z-6C348-A.

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