Dear Doctor: I own a 1999 Plymouth Neon. The air conditioner does not hold a charge. I had a lot of parts replaced recently, but still have the same problem. What is your opinion on a/c stop leak? Bob
Dear Bob: Before thinking about a stop leak product, try to find the source of the leak. Have the technician charge the system with an extra dose of dye. Then look for the leak. A common problem on this car is the evaporator in the heater box. As for stop leak, there are many different brands and offer money back guaranties. If the source of the leak is the evaporator and you do not want to spend the money for repairs, then stop leak is your only choice. Since your a/c does not work now, the stop leak cannot make it any worse.