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Does the alarm sound with just the key on?
Ok, when was the last time that the cooling system was serviced?
Most likely this was the overheat alarm. The cooling system on the engine should be serviced every three years. The impeller inside the water pump develops a set to it over time. When this happens, the pump can no longer provide enough cooling water to properly cool the engine. You are goign to need to replace the water pump impeller.