I will shamefully say i've used it :embarassed:. It must've been a pretty small leak in my system though, cause once we put some more R134 in, it cooled like a champ all summer. I know its not apermanent fix, but its what i could afford at the time. If it stops working, i'll just roll the windows down. I usually dont use the AC anyway, but when my wife's in my truck she wants in cool, and she's easier to get along with when she's cool.