What Causes the Squeaking Sound When Driving?

[Declan]

When a car makes a squeaking sound while driving, it is most likely due to an issue with the engine belt. First, check the tightness of the engine belt. You can try pinching the drive belt with your fingers and twisting it. Note that this operation should be performed when the engine is cool. The twist angle should generally be below 90 degrees; otherwise, adjustment is needed. Below is an extended introduction to engine belts: 1. The timing belt in a car is responsible for opening the valves. If the valves open improperly, they can "hit the cylinder," causing the engine to fail instantly. Once the timing belt breaks, the engine will be immediately ruined, so it is essential to replace the timing belt regularly. Engine belts are divided into timing belts and water pump belts. Timing mechanisms can use either belts or chains. Chains are maintenance-free and do not require attention during the vehicle's lifespan, whereas belts, being rubber components, will age and need replacement. The replacement interval for belts generally ranges between 50,000 to 120,000 kilometers. 2. If the timing belt reaches the manufacturer's recommended replacement mileage, it is advisable to replace it, as a broken timing belt can cause the camshaft to damage the valves, leading to expensive repairs. The water pump belt typically needs replacement every 50,000 kilometers. If there is a squeaking sound during startup or acceleration, it is often due to insufficient tension in the water pump belt. If the belt is not severely aged, the issue can be resolved by adjusting the tension, and the belt can continue to be used. Even if the water pump belt exceeds the manufacturer's recommended mileage, it can still be used if it is not severely aged, but replacement may be necessary depending on the condition.