I came out for a no cool, on the upstairs system. I checked the system over and found the compressor side of the dual capacitor was at 0. With approval, I installed a new dual capacitor and washed the condenser coil. I cycled the AC and check and all operations and charge. The system has been converted to 407c. All working properly. It is 85 upstairs. It will take 12+ hours to cool back down to normal.