They used to be copper and steel but now they are made of aluminum and plastic.
Aluminum
The car engine radiator.
The radiator is made of copper because copper transfers heat very well.
most car radiators are copper or aluminum and plastic.
The same material as your car or mine.
Polypropylene
It will be made of many components the casing material will not matter much.
Radiator cores are typically made of aluminum due to its high thermal conductivity. The end tanks can be made of plastic, aluminum, or brass. The pipes or tubes through which the coolant flows are usually made of brass or copper.
question- what was the car without a radiator? well it's probly a car without a stinking radiator,,,
Sheet Steel
Older vehicles had copper and steel radiators, newer vehicles are made of aluminum and plastic.