I have a Nissan Sentra 2008 and my A/C broke in October of 2016. The AC would be off completely but strong hot air would still be coming through the vents. The only time it would stop is when the car is completely off. 

It would get cold only when set to "low or above". Now the AC is fully dead and no air comes through the vents unless when I turn circulation off then only when I move forward I feel the air coming through depending on how fast I accelerate. So when I stop completely, no air comes through. But when I move forward, little air comes through. 

Some of my friends say I need a new blower resistor because that controls the air flow or something and others say blower motor. I believe if I am moving on "no circulation" and the air is coming through the vents, then the blower motor is fine. Or that its just my vents are open and the air is coming from somewhere else. Please help me decide so I don't get charged for unnecessary fixes.

P.S. the blower motor is behind the dashboard in my car.