Posted on 3/27/2026
A squealing noise at startup usually means one of the belt-driven parts under the hood is slipping, dragging, or struggling for a few seconds before the engine settles down. Most of the time, it happens in the morning, after the car has been sitting, or when the weather turns damp or cold. Some cars do it for only a second. Others keep doing it longer and louder over time. That sound is usually an early warning from the serpentine belt. Why Startup Is When The Noise Shows Up A startup puts a sudden load on the belt and every accessory it drives. The alternator has to recover from the energy used to start the engine, the pulleys begin spinning immediately, and the belt has to grip cleanly with no hesitation. If the belt is worn, glazed, loose, or contaminated, that first moment is when it is most likely to complain. That is why the noise often fades after a few seconds of engine running. The belt catches up, the pulleys stabilize, and the squeal goes away until the ... read more