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Depends on the materials used to construct the radiator and where the leak is. Make sure the radiator itself is actually leaking and that it is not a loose or leaking hose clamp.

Remove the radiator and take it to a radiator shop. They will tell you if it is repairable or not. Stop Leak and similar products are at best a temporary fix. With the age of this car you may end up being better off purchasing a new radiator. Replace the thermostat at the same time and flush the entire system. Install a 50/50 mix of the proper coolant. Also check all hoses for bulges and soft spots, and replace as necessary.

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