So I had a shop check my AC, it was only 5$ when I got my alignment. But they said it had no leaks, but was 5oz low on 134. So Instead of paying the 95$ they wanted I went to autozone and got a can with a Guage. I put in a small amount, and now the AC only blows hot air. Before this it blew moderately cold air. Now it's just all hot. The compressor turns on and off every 5 seconds or so, and it can be felt while driving. I work delivery in southern Arizona, so I really need AC for work. Any info would be helpful.