Serpentine Belt

Driven by the crankshaft, the multi-ribbed serpentine belt powers engine accessories such as the alternator, air conditioning compressor, power steering pump, and, sometimes, the water pump.

The serpentine belt is a modern, more efficient replacement for the earlier "V" belt design. The name serpentine describes the path of the flexible belt—it goes over and around multiple pulleys. This belt has its own tensioner and requires regular inspection and maintenance.