3. Or sometimes a critter can get caught in the fan
and cause it to screech and stop.
With luck, it's just the fan - obstructed or (like Mopar said) needs oil.
I don't know about WD-40. Some Kroil or other penetrating oil can free frozen bearings, then follow up with any lubricating oil you have around. Even a few drops from the engine's dipstick can work. And the dipstick can be used to apply oil to a hard-to-reach bearing.
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