A fan belt, also known as a drive belt, is a crucial component that keeps various engine systems functioning. It helps drive essential components like the alternator, water pump, power steering and cooling fan. Over time, and especially during the damper and colder seasons, your fan belt may begin to emit a high-pitched squeal, which can happen for the following reasons.
- Wear and Tear: Classic cars are known for longevity, but rubber belts degrade over time. Cracks, glazing, or fraying can cause the belt to slip, leading to squeaks.
- Improper Tension: A belt that is too tight or too loose can result in noise. Overly tight belts can prematurely wear the bearings of the component in question, whilst loose belts slip and squeak as they struggle to gain grip.
- Dirt and Debris: Dirt, oil, or other contaminants on the belt can cause slippage and squeaking.
- Misaligned Pulleys: If the pulleys are misaligned, the belt won’t move as smoothly, or grip as well, leading to that tell-tale squeak and increased belt wear.
- Temperature and Humidity: Sudden changes in temperature and moisture levels can temporarily affect the belt’s tension, or grip levels and cause squeaking.