Drive belts are part of a belt/pulley system that is driven by the engine crankshaft to run such items as the AC compressor, alternator, and power steering pump. Previously, the "V" profile was the universal drive belt design, but more modern vehicles use the flat "ribbed" design, often referred to as a serpentine belt.

Some highly sophisticated, modern vehicles have eliminated all drive belts by providing engine-driven internal shafts. Cooling fans, with few exceptions, are now run by compact electric motors.

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