As a subsidiary of General Motors, AC Delco is GM's single largest original equipment manufacturer. The name combines that of one of the founders Albert Champion with Dayton Engineering Laboratories Company. Drivers of any Chevrolet, Buick, Cadillac, or GMC can be sure that the reliability of their vehicle is owed, in some degree, to parts from this company. They produce a wide range of parts as diverse as fuel delivery parts, ignition coils, alternators, and steering components... just to name a few. AC Delco makes nothing but great products, and every service technician or mechanic knows that they are a premier brand.
Make sure your cooling fan assembly is running at 100%, and replace it if it isn't.