The air conditioner stinks when the coils gather dust and make water (condensate) and it becomes mold. what you should do is to change your furnace filter and clean it then spray the coils down with...
No ... their purpose is to transfer the heat from inside to the outside. No harmful chemicals are released to the air in this process unless the A/C system has a leak, in which it would no longer be...
Go to the mfr`s website and there should be a link there. Have the model and serial #`s for all pieces (condenser, air handler or furnace and the coil) handy when you do this.