Why are the pipes by the coolant red hot?

The pipes by the coolant may be red hot due to excessive temperatures caused by high-pressure coolant flow, insufficient cooling, or a malfunction in the cooling system. This overheating can lead to thermal expansion, which may compromise the integrity of the pipes. Additionally, if the coolant is not circulating properly or is contaminated, it can fail to absorb heat effectively, resulting in elevated temperatures. It's crucial to address this issue promptly to prevent potential damage or failure in the system.