Toyota Corolla loud squealing noise on cold start that disappears after warming up on Toyota Corolla

Some Toyota Corolla owners report experiencing a loud squealing noise on cold starts that disappears after the vehicle warms up. This issue may be attributed to damaged or loose serpentine belts, which can slip or rub against pulleys, especially in colder weather. Additionally, moisture from dew or rain can temporarily dampen metal components, leading to belt slippage and resulting in the squealing sound until the moisture evaporates. To mitigate this problem, some owners have found that tightening the alternator belt can help, while others suggest that allowing the car to 'beep' a few times before starting the engine may reduce the noise. It is crucial to address the underlying cause of the squealing to prevent potential engine damage, and if the issue persists, consulting a professional mechanic for an accurate diagnosis and repair is advisable.