accessory belt; drive belt: A V-shaped or flat serpentine belt that’s driven by a crankshaft pulley and transmits kinetic energy to various accessories, such as the alternator, air conditioning compressor, fan, power-steering pump, and water pump.

air filter: The element in the air cleaner that removes impurities from the air. Most air filters are disposable, although some aftermarket types can be cleaned and reused.

alternator: An engine part that generates electric current that’s stored in the battery and used to start the car and run the electrical equipment.

automatic transmission: A transmission that selects gears automatically, either by means of a hydraulic converter and a system of bands and clutches, or with an electronic transmission controller.