My car has some weird whining noise coming from the engine. It's louder when cold and the pitch changes with the RPM of the engine.


The AC Idler Pulley bearing was defective. I identified the defective pulley by removing it from the car and inspecting it. The bearing was almost seized. I replaced with a new part and this noise is completely gone.

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  • An explanation of how you identified the failing part may make the q&a better for others... – Solar Mike Jul 4 '19 at 5:24
  • @SolarMike How's that now? – Jean-Christophe Rodrigue Jul 4 '19 at 21:42

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