If its seems to be leaking inside the vehicle, could be the heater core. If no leaks from inside then replace the thermostat and fill back with just water, leave cap off and run for a while until you see the water flowing in the radiator. If not flowing then water pump needs to be replaced.
Check coolant level...next would be replace thermostat, then if needed flush and refill radiator/cooling system...any leaks?
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