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you mean the exterior fan for the radiator. Mine is loud when ever im outside (sounds like a damn jet) but in the truck its barely noticeable. Also it only happens on very hot days at idle when not moving.
Only when it's really hot out.... given you live in AZ Shaggy....I can only assume it will kick in quite a bit....That or you're really old and paranoid when you hear a noise when this is really nothing