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Just started hearing a whinning sound from front of engine. Can't tell if it's coming from altenator, power steering pump or water pump. Serpentine belt was showing wear so I replaced that but the sound still persisted. No coolant leaking near water pump but vehicle has 101k miles with original pump so I replaced the water pump but sound still persisted. Belt tensioner appeared to be in good shape when I removed it while replacing water pump. I'm thinking it's gotta be the altenator or power steering pump. How do I know which one is causing the noise?