Serpentine Belt Loose? Listen to This!
Listen for a high-pitched "screeching" sound while the engine is idling and/or on acceleration. This noise could mean your serpentine belt is loose and may need to be replaced. Examining your belts regularly for cracking, fraying and extra slack can help prevent engine failure. Replace or tighten the belts as needed.
Learn more about serpentine belts in How Cars Work.
