Toyota RAV4 grinding noise under hood from pulley system issue after replacement on Toyota RAV4

Some Toyota RAV4 owners report experiencing a grinding noise from the pulley system after a replacement, which may indicate potential issues such as a loose or worn serpentine belt that controls engine accessories like the water pump and alternator. Additionally, some owners find that the noise persists even after removing the belt, suggesting a faulty pulley, water pump, or alternator as the source of the problem. If the noise becomes louder under acceleration, it could indicate a bearing wearing out in the pulley system. To address these concerns, owners are advised to inspect the serpentine belt for wear or looseness and check the pulleys, water pump, and alternator for damage. If the issue continues, consulting a mechanic or a Toyota dealership for a thorough diagnosis is recommended to ensure the proper functioning of the pulley system.