Did the car squeak when it turned off?

Usually, there may be the following reasons for the clicking sound after the car is turned off:

1. Abnormal noise caused by uneven cooling of the engine: After the car runs for a period of time, the engine temperature is very high. After flameout, the temperature of each component cannot be directly proportional to thermal expansion and contraction, which will inevitably lead to abnormal noise caused by friction of metal parts inside the engine due to cooling contraction.

If this is the reason, you can try not to stop the engine immediately and wait for a while. If there is still a click after doing this method, you should go to 4S to check it.

2. If the car is equipped with a turbine, it may also be the cooling sound of the turbine: under normal circumstances, the exhaust gas temperature reaches 6 or 700℃, and the temperature generated by the friction caused by the rapid rotation of the turbine after flameout will be obvious, thus making an abnormal sound.

3. Cooling sound of the exhaust pipe: Generally, when the cold car is idling, the temperature of the exhaust pipe can be more than 200, and the temperature will be higher when the car is heavily loaded or there is mixed gas burning in the exhaust pipe, so the exhaust pipe will also expand with heat and contract with cold to make abnormal noise, which often comes from the front end of the exhaust pipe and the soft joint.

4. Cooling sound of three-way catalytic converter (generally at the bulge of the first section of automobile exhaust pipe): the normal working temperature of three-way catalytic converter is 400-800℃. After the flameout, its work will slowly stop, the temperature will drop, and the metal parts inside will expand with heat and contract with cold, and then make an abnormal noise.

The abnormal sound of most cars after flameout is normal, so you can check it if you are not at ease.