What Causes the Strange Noise from the Front of the Car After Turning Off the Engine?
2 Answers
This is a normal phenomenon, and if you listen carefully, the noise comes from the muffler. Here are the reasons why the front of the car still makes strange noises after turning off the engine: 1. Thermal Expansion and Contraction: The muffler is basically at the end of this system, and its function is to reduce the noise of exhaust. When the muffler is working, it has to withstand the impact of hot airflow, so it naturally heats up. After parking, due to thermal expansion and contraction, it will make a 'ding ding' sound, and sometimes there will be a 'click click' sound, all of which are normal phenomena. 2. The Car Makes Noise While Driving: It's just that you didn't notice it, and you can drive with confidence. If the muffler is about to be damaged, it will make a continuous 'clattering' sound while driving, and the noise will change significantly when you step on the accelerator.
Last time my car stalled and the front was still buzzing, I really thought something serious had happened! Asked a mechanic, and this is common when the cooling fan is still working, especially on hot days or right after a high-speed run. The engine gets extremely hot, and the fan will automatically run for a few more minutes to cool it down. If the sound is more of a clanking or cracking noise, it’s likely the metal parts of the exhaust system contracting—they can make popping sounds as they cool, similar to the sound of frying steak. If the noise is a squealing or grinding sound, you’ll need to check if the belt or a wheel is loose or worn out. Ignoring it could damage other parts. Overall, most cases are normal, but if the noise lasts more than five minutes, it’s time for a check-up—don’t delay like I did. Remember, sounds from the fan or thermal expansion/contraction should disappear shortly. If they don’t, it’s best to visit a professional shop.
