Have a new sound coming from under the hood of 2003 F150. Best way I can describe it is a buzzing/humming sound, similar to almost the way an RC Drone sounds, but a little deeper. It is there idling, in park, drive, reverse. Does not get any louder or quieter with any change, just eventually gets drowned out by road noise. Started last week after nailing a pot hole.
Family mechanic said it was just the “normal power steering whine” but I’ve heard the power steering whine before, and this is a brand new sound the truck has never made before.
5.4L XLT, V8, 4x4, 329,000km (204,xxx miles)
Any ideas as to what it could be before I maybe get a second opinion on it? Thanks!