Long life coolants that can go up to 5 years or 100,000 miles can help reduce the need for maintenance while extending corrosion protection. Other causes of radiator failure include cracks from vibration and mechanical stress, and physical damage. Excessive heat can be another cause of radiator failure. Radiators with plastic end tanks can be damaged by steam erosion if the coolant level becomes low and the engine overheats. White deposits on the inside of the plastic tank would indicate steam damage.
Replacement is usually more convenient and reliable than having an old radiator repaired.
The replacement is usually the same type of metal as the original and designed for a perfect fit every time. Up until the 1980s, aluminum radiators were rare. But in the 1980s, vehicle manufacturers began using aluminum radiators in greater numbers because of the weight savings that aluminum makes possible. If the old radiator failed because of internal corrosion or clogging, the cooling system should be flushed to remove contaminants. The condition of all belts and hoses should also be inspected.