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No heat means the coolant isn't being circulated through the heater core. Since it's overheating it isn't circulating through the radiator. Either the thermostat is stuck closed or you've got a chunk of something blocking something.
Start with getting the car warm and feeling hoses. They should all be warm with the heat on. If not, trace the hoses back to where they stop being hot and that's where your problem lies.
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