Why does the clutch not make noise when cold but does when hot?

[PeterLee]

Clutch not making noise when cold but making noise when hot is because the engine lacks oil. The following is an introduction to engine-related content: 1. Energy conversion: An engine is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. For example, an internal combustion engine usually converts chemical energy into mechanical energy. 2. Device: An engine can refer to both a power-generating device and the entire machine including the power device (e.g., gasoline engine, aircraft engine). The engine was first developed in the UK, so the concept of the engine also originates from English, and its original meaning refers to "a mechanical device that generates power."