Thanks. I am not sure if I will buy the stuff from autozone now or wait till I get back from vacation. Of course I drive from nyc to orlando florida and my ac doesnt work. Of course I did not know since its winter and cold in ny. If I did put the r134 in, and use just like one can it won't damage the system if there is another problem, like a leak somewhere or a bad compressor? I think the compressor is fine because when I am parked and turn the ac on, I can feel the compressor come on.