Air conditioner not blowing cold air on 1999 Nissan Altima

Works but warm air coming out

1 answer
Too many possibilities. Low on refrigerant (then whats leaking?), pressure switches (which one?), control head, false sensor reading to computer telling it to turn off. I can go on and on. Take it to a shop and have it diagnosed. It will save you money in the long run to repair the cause than to guess and just put parts in it.