What would make a car overheat and headlights go dim randomly?

A car can overheat due to several factors, including a low coolant level, a malfunctioning thermostat, or a failing water pump, which disrupts the engine's cooling system. Dim headlights may occur because of a weak battery, a failing alternator, or poor electrical connections, which can also lead to overheating if the engine's electrical system is strained. If both issues arise simultaneously, it could indicate a serious electrical problem or a fault in the car's charging system affecting both the engine cooling and electrical output. It's important to have the vehicle checked by a professional to diagnose and address these issues.