A drive belt (or serpentine belt) is a crucial, long-lasting, reinforced rubber belt that transfers power from the engine's crankshaft to components like the alternator, water pump, power steering, and A/C compressor. Replacing them, typically recommended every 50,000 to 100,000 miles, prevents sudden failures that can cause steering loss, overheating, and battery drain.
Function: They drive peripheral devices such as the alternator, water pump, air conditioning compressor, and power steering pump.
Location: Located on the outside of the engine (unlike the timing belt), often snaking through multiple pulleys
Material & Type: Primarily multi-rib or V-ribbed belts designed to work with automatic tensioners to keep them tight.