What causes the hissing sound when a car engine is first started?
2 Answers
The reasons for the hissing sound when a car engine is first started: 1. If the car has not been used for a long time, the engine oil will return to the oil pan. When the vehicle starts, the valves will lack the sealing and lubrication of the oil, resulting in a hissing sound, which is normal; 2. The abnormal sound from the belt during startup. In this case, it is necessary to promptly check whether the belt has a problem. An engine is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines, external combustion engines, jet engines, electric motors, etc. For example, an internal combustion engine usually converts chemical energy into mechanical energy. The engine can refer to both the power generation device and the entire machine including the power device.
My car had a similar issue last time - a hissing sound right after startup, like air leaking or belt friction. Based on my experience, this is mostly caused by belt problems. Think about it: those rubber belts in the engine compartment harden and age over time, with small cracks possibly appearing on the surface, making them prone to slipping and producing this screeching sound during startup. Some vehicle models may experience this when the alternator belt or AC compressor belt becomes loose. Of course, it could also be something more troublesome like water pump bearing wear or compressor failure causing abnormal noises. For safety, I recommend checking the belt condition as soon as possible to see if there are cracks or looseness. If you can't handle it yourself, it's best to take it to a professional repair shop - they can precisely locate the issue using a stethoscope. After all, a broken belt is dangerous as it can suddenly cause loss of power steering.
