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You may not see any difference in actual capacity of the radiator - it is possible for deposits to be present on the insides of the tubes that reduce the heat transfer (normal corrosion deposits can occur in only a few years from aluminum reacting with antifreeze). So you can have a radiator that 'holds' the same amount of liquid, but its heat transfer rate is very slow. What you get then is adequate cooling at low demand (puttering around town) and overheating when the demand exceeds the heat transfer abilities of the system.
When does yours overheat? If it overheats just from idling in your driveway, then you have a water pump issue, or a thermostat stuck closed, or even a nasty air bubble somewhere. But if it overheats only when the motor is working hard, then you have low heat transfer in the radiator.
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