If your no mechanic you must find out if there is any freon in the system, if it operating in a vacuum you must do a leak detection on it, suck it into a vacuum again and add freon. If it has some freon in it you can just add more freon. If you add freon to a system in a vacuum it will cause ice to form inside the lines, and it will clog it up, it has to be a clean pure zero enviroment inside the lines.