Why is there no abnormal noise when the car is cold but noise occurs when the car is hot?

[VanIsabel]

There are many reasons why there is no abnormal noise when the car is cold but noise occurs when the car is hot. Reasons for abnormal noise when the car is hot: A certain part of the body may be loose, and the frequency matches when the car is hot, or the RPM is either too high or too low, causing abnormal noise. This is a relatively common occurrence and generally not a major issue. There may be looseness or lack of oil in the transmission, such as excessive gear meshing clearance. When the clutch is pressed to cut off the power, the abnormal noise disappears. Other reasons for abnormal noise inside the car: Brake noise is often caused by rust on the brake disc, hard objects in the brake pads, or severe wear of the brake pads. The solution is to stomp on the brakes a few times to see if it alleviates the issue, then inspect the brake discs and pads. Tire noise can occur for various reasons, including driving speed, tire type, tire pressure, and road conditions.