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How To Replace Serpentine Belt Made of reinforced synthetic and/or hard rubber, belts are usually v-channeled or ribbed serpentine They're used to drive accessories including the alternator, water pump, AC compressor, power steering, air pump, vacuum pump and injector pump. They're usually driven by the engine's crankshaft pulley and are fully adjustable by tensioners or idlers that follow or track the surface of the belt. PARTS Tools and Supplies Needed Socket set and ratchet Serpentine Belt Protective eyewear and gloves. Flashlight Accessory Belt Idler Pulley Accessory Belt Tensioner Screwdriver . Before you begin place your car on a flat surface with the engine "off" in park with the parking brake on. Wear protective clothing, eyewear and gloves to avoid injury. Safety Tip: Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or closed toe shoe

Serpentine Belt Tensioner Replacement Belt Tensioner Operation: This device functions as an idler pulley and is located on either the inside or outside of the accessory drive belt. Its provides the correct tension for initial belt adjustment and maintains this critical tension adjustment during vehicle operation. It can be found on conventional V-belts and the newer serpentine ribbed belts. Inspect the belt tensioner for the following conditions: Noise If the belt squeals, the tensioner force may be insufficient. Check the belt length gauge, if the length is correct, replace the tensioner. If the tensioner clatters or rattles during engine operation, there may be internal interference or wear. Replace the tensioner. If the belt chirps, you may have a worn pulley or tensioner or cracks in the tensioner bas or arm. Check the mounting bolts, if they are okay, replace the tensioner. Sticking or Seized Tensioner or Idler If the tensioner does not operate smoothly