Car Smarts Improve your automotive I.Q. with Car Smarts from NAPAonline. You'll be better informed about how your car works and what it takes to keep it running smoothly. Without proper cooling, the engine's operating temperature can soar causing the engine to overheat. Severe overheating can be very damaging to the engine, so the radiator must be capable of cooling efficiently and remain leak-free. Though most people don't think of a radiator as a wear item, they do eventually need to be replaced.
Corrosion is the main problem, which is accelerated by cooling system neglect.
As the corrosion inhibitors in the antifreeze are gradually depleted over time, the alkalinity of the coolant changes allowing corrosion to start inside the radiator and cooling system. This condition can lead to leaks as well as restrictions. With conventional antifreeze, the coolant should be changed every 2 years or 30,000 miles. 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.