Why does the car make noise?
2 Answers
Cars may make noise due to electrical currents inside the vehicle and the sound of thermal expansion and contraction in the engine compartment, which is a normal phenomenon. Below are related solutions for abnormal noises after the car is turned off: 1. Observe the cause without turning off the engine: Try not to turn off the engine immediately after parking and wait for a while. If the noise persists after doing this, it should be checked. 2. Engine metal components: If there is no noise when you wait a while before turning off the engine, it means the noise is caused by friction between some metal component joints in the engine due to cooling contraction, which is normal and does not require maintenance. 3. Normal electrical current situation: If there are no other abnormalities with the car, it is a normal phenomenon and does not require maintenance.
There are many reasons why a car makes noises. For example, a loose or worn engine belt will squeak when rotating—my old car often does this, especially during cold starts when the sound is more noticeable. A leaking exhaust system can produce a puffing sound; I once had to replace the exhaust pipe to fix it. Worn brake pads will squeal when braking, which happened to me due to aggressive driving accelerating the wear. Aging shock absorbers or loose springs in the suspension system can cause a thumping noise over bumps, and regular replacement can prevent this. A damaged wheel hub bearing will produce a whirring sound while rolling, getting louder at higher speeds. Other minor issues, like excessive body gaps, can lead to wind noise. Whenever I hear unusual sounds, I check immediately to avoid bigger problems—safety comes first.
