[summer wine]

1月份换的排气系统，也有快4个月了，开完车停下来，车底下总有“叮叮”的噪音，过大约半个钟头才消失。这是正常的吗？

[ccc]

正常，热胀冷缩的缘故。

[summer wine]

谢谢答复。那么这种响声要持续发生到什么时候呢？

作者: ccc

正常，热胀冷缩的缘故。

[ccc]

作者: summer wine

谢谢答复。那么这种响声要持续发生到什么时候呢？

If you don't hear 这种响声 at all when the temperature is below 10-15 degrees, it could be the time to change it again.

[summer wine]

So it is good to hear the noise, right?

作者: ccc

If you don't hear 这种响声 at all when the temperature is below 10-15 degrees, it could be the time to change it again.