hey guys so when i put freon into the car and turned it off it made a hissing noise. So i figured it was just the freon going through the lines. When i try to use the a/c it would not get cold. So i took it to the local shop and they said the car would only take half the freon so he suggested that it might be a clog lined or the compressor. Any idea what could be the problem because he is going to charge me 200 to flush the system