The answer is not that simple. If there is any air in the system then you have to remove the R-12, fix all leaks, vacuum it down and then recharge. If you are "just" trying to "top off" it is kind of a guessing game because you never know how much is in the system so you can't know how much to add. Overfilling the system is BAD. Short answer is, Yes, you can top off with Freeze-12 but only under specific conditions. If you do not have a gauge set and cannot monitor the system pressures what you are attempting can be dangerous. Without the proper tools and experience work on the A/C system is best left to professionals. There are some jobs it just doesn't pay for the individual to try. Among them are the following: Tire work, mounting and balancing * (The ones with the * I Alignment work * (don't do, no one can do Glass installation (it all!) Frame repair A/C work Automatic transmission Out-of-Car Service Radio repair Painting * Torsion Bar adjustment Now I am sure you can pick one or more of these things to argue about. I pick them because they can be dangerous, you need experience and/or special tools, or it just doesn't pay economically to do it. Don't worry, there are still PLENTY of other things most people can do on their cars!!!!!! David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, Chris Shepherd <chrisau79@...> wrote: > > Is it necessary to vacuum out R12 prior to charging with Freeze 12? How many cans of Freeze 12 are used to bring the system to full charge? > > Chris > 06301 > > > > > [Non-text portions of this message have been removed] > ------------------------------------ To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnewsYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/