What causes overheating in 2000 Toyota Avalon?

Overheating in a 2000 Toyota Avalon can be caused by several factors, including a malfunctioning thermostat, a failing water pump, or a leak in the cooling system, such as a damaged radiator or hoses. Additionally, low coolant levels due to evaporation or leaks can lead to insufficient cooling. A blocked radiator or a malfunctioning fan can also impede proper airflow, causing the engine to overheat. Regular maintenance, including checking coolant levels and inspecting the cooling system, can help prevent these issues.