What Causes an Engine to Overheat and Boil Over?

[Noah]

The reasons for an engine overheating and boiling over include the following situations: Thermostat failure, water pump failure, water pump belt slippage. Leakage in the cooling system pipes or components, radiator cap failure, insufficient coolant in the expansion tank or overflow system malfunction. Poor heat dissipation from the radiator itself, such as scale buildup or bent cooling fins, radiator vents blocked by insects or dirt, cooling fan not operating, which could be due to a faulty fan, faulty temperature switch, blown fuse, relay, or wiring issues. Solutions: Loosen the radiator cap slightly to release a large amount of steam from the radiator, then slowly open the radiator cap completely; after the temperature drops, check if the coolant is low and add coolant if necessary; clean engine dust.