Posted on 9/26/2025
A high-pitched squeal from under the hood can be one of the most annoying sounds a driver hears. In most cases, the culprit is the serpentine belt, a single, long belt that drives multiple components like the alternator, power steering pump, water pump, and A/C compressor. When it begins to slip, misalign, or wear out, you’ll usually hear that distinctive squealing sound. Because the serpentine belt connects so many systems, ignoring the noise can lead to bigger problems, including power loss, overheating, or even a breakdown. Knowing why belts squeal and what you can do about it will help you avoid unexpected repairs and keep your car running smoothly. Worn or Glazed Belt Surface Over time, serpentine belts wear down from constant friction and heat exposure. When the rubber hardens and becomes glossy, the belt loses grip against the pulleys, which causes slipping and squealing. Glazing is often a sign that the belt has reached the end of its life and needs re ... read more