My '95 Sonoma has developed a leak in the AC system. I recharged it a couple of weeks ago with some R 134a from Advance Auto. Now it's blowing warm air again and the compressor constantly cycles, just like the first time it lost refrigerant. Now I'm thinking about using some of that AC stop leak to see if that will fix it. So, my question is, does that stuff really work, or will it do more harm than good? Let me hear your experience with it.