Something is wrong with my ac... it works on 1,2,and 3 but doesn't work on the 4

What is your question?

Something is wrong with my ac... it works on 1,2,and 3 but doesn't on the 4th one. Before that every now and then it would blow out smoke, not heavy but light for like 15secs every now and then. Does anyone know what's wrong?

How long has your 2009 Nissan Cube had this problem?

Couple days