Metallic Whistle/Hoot Noise After A Cold Soak - 2007-2008 Ford Lincoln Mercury

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COLD START FEAD HOOT – WHISTLE NOISE

FORD:	2007-2008 Mustang, Expedition, Explorer Sport Trac, Explorer, F-150
LINCOLN:	2007-2008 Mark LT, Navigator
MERCURY:	2007-2008 Mountaineer

2007-2008 F-150, Mustang vehicles equipped with a 4.6L and 5.4L engine; 2007-2008 Mark LT, Expedition, Navigator vehicles equipped with a 5.4L engine; Explorer, Mountaineer, Explorer Sport Trac vehicles with 4.6L engine may exhibit a front end accessory drive (FEAD) related high-pitched metallic whistle/hoot noise after a cold soak in ambient temperatures below 40 °F (4.4 °C).

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

SERVICE PROCEDURE

NOTE: FEAD IDLER PULLEY NOISE MAY BE MOST APPARENT AT OR NEAR COLD ENGINE IDLE SPEEDS (APPROXIMATELY 1200 RPM). NOISE DURATION IS LESS THAN 10 MINUTES AFTER STARTUP AND WILL BE ELIMINATED WITH FEAD BELT REMOVED.