did you try hooking the bottle up the the compresor itself? you might have to take the lines off the compresor to do this but It will tell you if the compresor is shot. Also before you take the lines off clamp down the lines on the rubber part real hard so you dont loose the freon and preasure of your sytem. If that doesnt work Jam the bottle of freon into the High Side (red cap) make sure you go it tight and have a friend start the car with the a/c on.