If it happened suddenly, it is probably the blend door actuator.
Please see my tip at http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info. Your blend door actuator is above the accelerator pedal. See picture below.
I just had the same problem, and it was my blower motor, which is located under the glove box, with 4 1/4 screws removed I dropped the motor down, oiled it with some 2 in 1 oil spun the fan turbine a few times and wala it worked great ! Hope this helps
my 2010 heater stopped working the fan is blowing cold air, my wife said where was a heat smell burned the inside of her nose, what could that be???
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