I brought my car to a mechanic to repair the air conditioning. They told me the compressor was out, and so they charged me $600 to replace it. About a week later the AC was no longer blowing cold. I took it back, and they tried some things, not sure what, but it also didn't work. So I took it back a third time and they replaced the air compressor, at no charge. About 5 days later, no cold air. Took it back again and now they are saying they found the leak, and it is the condenser, and it too will have to be replace for another $315 or so. Does this sound legit? It seems that this all should have been done at once, so I am wondering how much additional labor is warranted to replace the condenser, and would it have been cheaper to have it all done at once.