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If you are getting no heater fan inside, then probably the heater blower motor resistor or fan motor. If the fan blows and you get cold air, then check the coolant level in the radiator first. If coolant level is good, then check to make sure the heater control head in the vehicle is actually on heat position, with regards to the heat door down below under/behind dash. Sometimes the actuator door/heat blend door get's stuck or broken in one position. Also could be a stuck thermostat or clogged heater core. If a clogged heater core, could try switching hoses at firewall to unclog.
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