The serpentine belt is a vital component in your car's engine, driving multiple systems to keep your vehicle running efficiently. But what exactly does a serpentine belt do? This essential belt powers the alternator, power steering pump, water pump, air conditioning compressor, and sometimes other critical parts—all from a single mechanism. Understanding its role can help you identify when maintenance or replacement is needed, ensuring your car performs reliably. In this guide, we’ll explain the serpentine belt's functions, why it’s crucial, and how to maintain it effectively.