A car's radiator is used to help keep the engine cool. During operation, an engine's moving parts create friction, which produces heat. Coolant flows through the engine picking up that head and travels back to the radiator where it is cooled down by air flowing through the radiator coils. The cool coolant then travels back through the engine completing the cycle over and over.
To drain the radiator when it is time to change the coolant.
The purpose of a radiator hose is to connect a radiator to the moving engine of a car. You can learn about radiators at the Wikipedia. Once on the page, type "Radiator" into the search field at the top of the page and press enter to bring up the information.
The purpose of the air valve in a steam radiator system is to release trapped air from the system, allowing steam to flow freely and efficiently heat the radiator.
The purpose of the overflow tube in a car's radiator system is to allow excess coolant to flow out of the radiator when the engine is hot and the coolant expands, preventing pressure buildup and potential damage to the radiator or engine.
The purpose of a radiator is to transfer heat as quickly as possible. It is pretty much the opposite of an insulator.
The purpose of a steam radiator valve is to control the amount of steam that enters the radiator, thus regulating the heat output of the radiator. The valve opens and closes to allow more or less steam to flow through the radiator, adjusting the temperature in the room.
Some have an internal transmission cooler & extra small internal radiator for that purpose.
To direct the air flow through the radiator.
The radiator cools the water which then goes to your engine to cool it off, as cool water enters your engine hot water from the engine enters your radiator
To speed up the transfer of heat energy.
A radiator fan is used to help cool the engine by blowing air across the radiator, which dissipates the heat generated by the engine. This prevents the engine from overheating during operation.
Exchanges heat from the coolant to the air which flows through the fins.