Could I have prevented a broken radiator?

My 98 honda civic started running really hot Tuesday. At first I thought it was just when the a/c was on, but yesterday it almost over-heated even with it off. Today, I drove it a few blocks to the car mechanic, stopping the engine a couple times along the way to keep it from over-heating. Today, the mechanic says it's a broken radiator and will cost over $700 to repair.s there anything I could've done to prevent this? It does have alot of miles on it. I

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