GMC Yukon XL squeaking noise from engine belts on GMC Yukon XL

Some GMC Yukon XL owners report experiencing squeaking noises from the engine belts, often attributed to issues with the serpentine belt, which may become more pronounced during acceleration or in humid conditions. Additionally, a misaligned pulley or accessory drive belt can contribute to chirping or squealing sounds from the engine compartment. High-pitched squeals are frequently linked to tensioner and idler pulleys, while lower growling noises may indicate problems with other bearings. Some owners use a water test to diagnose the noise, finding that spraying water on the belt can temporarily eliminate the sound, suggesting the need for a new belt or identifying issues with pulleys due to oil or coolant leaks. Furthermore, squealing noises from the timing belt cover may signal a failing water pump pulley, which could lead to overheating if not resolved. While applying WD-40 behind the tensioner pulley can provide a temporary fix, it may indicate a problem with the pulley bearing. Lastly, if the noise diminishes when the belt is flipped, this may point to a misaligned pulley needing attention.