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I just bought a used 2002 Hyundai Ascend at used car dealer today.
I just realize the air-condition  does not work. I ask the mechanic
why he said a small rock has broke down the tube (I don't know anything) of
radiator so it need be removed for new one for cost $500 + $400 for labor cost to fix it. Does anyone can help me?

Is it not contribute to overheating? I just wondering weather a/c has direct connection with radiator or not.