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Under hood noise sounds like a bad alternator bearing but its not. Dodge Ram 1500
2005 dodge ram 1500 4.7L engine , automatic trans, with ac, noise only appears after engine is fully warmed have checked all pulleys replaced water pump and fan clutch, noise also continues for a few seconds after engine is turned off. Noise is high pitched whine, any ideas? Have checked tensioner and idler pulleys, and changed belt. What can make this noise after engine has stopped rotating ?