I have a 2007 turbo and when I turn on the AC, I heard "gargling" sounds and from what I have figured from the forums, it sounds like the refrigerant is low. Do you think that is the cause of the noise?

Has anyone used acprocold? It's basically a can and you connect it to the AC and fill up the refrigerant. Any thoughts, pitfalls and etc. on it and if you used it, can you let me know which product you used?

Thank you.