That's the problem with taking it to an A/C place. They will come up with a quicky diagnosis that may or may not be the actual problem. I love the way they just take yor money and don't guarantee results. You have to get acquainted with your system and spend some time trying to see what the actual problems are. It may take several hours of just running the system and trying different things until you come across your answer. I know I was going crazy trying to diagnose a minor problem I had with the cheapy low side gauge and it was giving me faulty readings. Once I got my manifold set I was able to set the system up properly.