Review on LotFancy Freon Leak Detector: Ultimate HVAC Refrigerant Gas Leakage Tester for Home & Professional Use - CFCs, HCFCs, HFCs, R134a R1234yf R410a R22 R11 Compatible, High Accuracy & Indicator Light by Fernando Marshall

work. My mechanic wanted $1,000 to replace the condenser. He said since he couldn't find the leak anywhere else, that must be the problem. Using a leak detector, I found that freon was leaking from one of the valves used to fill the system. (These are called Schrader valves.) Only one was leaking, but I changed both of them. I also changed the rubber rings in the plastic caps that close the valves. Valves cost two dollars and are changed each time. A box of rubber rings costs $15 online. I also had to fill the system with freon. Total repair cost was less than $50. Freon leaked so much that the air conditioner didn't work for about two days. It's been 6 weeks and the AC is working fine. It was a bit difficult to set up frbovr the first time I used it. But once you get used to it, it's not a problem.