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This could be the fuse check the fuse panel. This could be the resistor in the heater plenum behind the glovebox, it could also be the heater fan motor. The easiest thing to check is the fuse, then use a volt meter on the heater fan motor and if you have voltage there, it is the motor. If not it is most likely the resistor.
Is it smoke or steam? Many times it is a bad heater core, hose or other issue. If you find the coolant level in the radiator is disapering then this shows to check what I mention above. If smoke then you have to check the wires for signs of burnt and melting insulation.
It is probably a heater core or hose though. A tip... He over use tap water in your cooling system. Only use distilled water or heater cores, radiators and worse problems may occur.