I recently had a no cooling call. Found very low on charge and just been charged up last week. I then explained the options of just changing system out. It is a 20 yr. old tempstar. She said that the tech before suggested putting some type of leak stop in the lines. I passed on this in fear of what it may do to compressor. I dont want a customer to say well the compressor was fine before you worked on . I gave a changeout ballpark quote, billed and left. I am wondering what you fellas might have done?