The 1st thing is to see if the heater core has flow, check this by touching the in and out hose of the core at the engine firewall, if both are hot then the heater core is ok, at that point u will have to check the blend door to see if it moves, this door diverts the air over the hot heater core or the cold AC evaporator core, it is often controlled by a small special electric motor, it is called the blend door actuator motor, if it fails it will useually fail in the cold air position, to change this motor u must remove the dash.
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