Ford claims (to me anyway) that it works on some and not on others because this is a very intricate procedure and not all dealerships do it right. I have had those parts put in my car twice now and still have a leak. Oh, and Ford also admitted that this problem does only seem to occur in cold weather which explains why I went from Feb to Oct with no leak and it came back in Feb. Very frustrating! Hopefully, you will have better luck with yours.