03 Diagnose Underhood Engine Noises
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As noted in the text, a mechanic's stethoscope is a wise buy for your toolbox. Begin by testing all of your engine's accessory drive items–the alternator, power steering pump, Thermactor air pump, water pump, tensioner pulley, and so forth. Anything that spins has a bearing and can make a noise. The rear case bearing on alternators is a common issue and is being checked here. View Related Article
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