What is a Serpentine Belt? A serpentine belt (also known as a multi-rib or poly-V belt) is a single, continuous belt that drives multiple accessories in a car engine. It's called "serpentine" because it winds in a snake-like pattern around different pulleys connected to these accessories. It replaced the old system of having multiple individual belts for each accessory. What Does it Power? A serpentine belt typically powers: - Alternator: Generates electrical power for the car's battery and systems. - Power Steering Pump: Assists in steering, making it easier to turn the wheel. - Water Pump: Circulates coolant to keep the engine cool. - Air Conditioning Compressor: Compresses refrigerant for the air conditioning system. - Other Accessories: Depending on the vehicle, it might also power the air pump, fuel pump, or other components. The serpentine belt is driven by the crankshaft pulley, which is connected to the engine's crankshaft. As the crankshaft rotates, it turns the belt, which in turn powers the various accessories. The belt tensioner keeps the belt tight, ensuring proper power transfer. A broken or worn-out belt can cause a variety of issues, including: * Inability to start the car * Loss of power steering * Overheating engine * Malfunctioning air conditioning * Electrical system problems Serpentine belts have a limited lifespan and should be replaced regularly, typically every 60,000 to 100,000 miles. Signs that it might need replacement include: * Cracks or fraying on the belt * Squeaking or squealing noises * Visible wear or glazing on the belt surface * Difficulty starting the car See less