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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.

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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.

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

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