A serpentine belt is a single, continuous belt use to drive multiple peripheral devices in an automotive engine, such as an alternator, power steering pump, water pump, A/C compressor, air pump, etc. The belt may also be guided by an idle pulley and/or belt tensioner. The serpentine belt was invented by Jim Vance while working for the Gates Rubber Company and first used by Ford Motor Company for the 1979 Mustang.