A driver notices steam coming from the radiator after a long drive. What does this most likely indicate about the radiator's function?
The radiator is failing to remove heat effectively
The radiator's job is to transfer heat from the hot coolant to the passing air, keeping the engine at a safe temperature.
If the coolant reaches boiling point, steam forms and escapes, showing the heat is not being carried away fast enough.
Steam after a long drive therefore signals overheating because the radiator is not removing heat effectively.
This has nothing to do with fuel lines, tyre pressure, or overfilling; it is a cooling-performance problem.
Hence, the answer is the radiator is failing to remove heat effectively.
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