What are the symptoms of high engine temperature?

[DeEvan]

An excessively high engine temperature manifests in the following ways:1. When the engine temperature is too high, the intake air temperature also rises, resulting in reduced actual air intake volume. This decreases the engine's volumetric efficiency, leading to diminished power and torque output, which manifests as insufficient engine power.2. At excessively high temperatures, the combustion chamber reaches extremely high temperatures that can easily reach gasoline's ignition point, prematurely igniting the air-fuel mixture and causing engine knocking. This creates severe engine impact and vibration, subjecting components to additional shock loads that may cause premature failure.3. When overheated, pistons undergo excessive thermal expansion, reducing or even eliminating the clearance between pistons and cylinder walls. This increases piston movement resistance and may even cause scoring damage to both pistons and cylinder walls.