OK I have the kit to add freon to auto A/C. Works on most. Got a Tarus I was trying to charge and they say you charge on high side on this one?? Anyway my adapter won't fit on port on high side and can't get low side to take anything. It is low on freon. I thought low side was sucking all the time and would pull it in. My kit will go on low side. Doesn't seem to fit as well as it should but I thought it should pull freon in. Adapter won't snap on as it should but I am holding it in place and trying to charge?? Just charged a Chevy with it??