The most common cause of this is a blown head gasket,but before you go to that expense i suggest that you try replacing the thermostat and gasket,of find or find out whether or not the radiator fan is or isn't working.If the fan is not working and you sit in traffic idling for long periods of time the car will overheat and then anti-freeze will run out of the overflow.Let me know if you need more help.
Possibly a weak radiator cap. replace cap.
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