What regulates the temperature in the engine?

The temperature in an engine is primarily regulated by the cooling system, which includes components like the radiator, water pump, thermostat, and coolant. The thermostat controls the flow of coolant to maintain optimal operating temperature, while the water pump circulates coolant through the engine and radiator. Additionally, engine oil helps dissipate heat, and sensors monitor temperature to ensure the engine operates efficiently and prevent overheating.