I am very DIY handy and I am installing a generator today Got the frame done yesterday. I discovered this problem lastnight. I don't have a vacuum pump I don't have an AC manifold,no hoses, no license to get the R22 and I don't have silver solder nor do I have the nitrogen to flush out the oxygen in the system. and I totally agree that the low coolant situation is a leak in the system, which is unreparable . I just don't have the money to buy two A/C units. I will call Colaw who is in Carthage Mo. I bet they will want a small fortune for even a used unit. I will try the capacitor. I can take it from the front unit and see if that is the problem before I buy a capacitor. They are the same exact units.