I need some feedback on Freeze 12 or Hot Shot.  I still have R12 in my a/c system.  If I opt to go the freeze 12 route can it just be mix w/ the R12 and oil in my system.  I don't want to convert to 134A unless I have too.  It looks like I will also need to buy an adapter kit if I go with the Frezze 12.  Any and all feedback is welcome.

hey bud i am a ac business owner in dallas texas and unless you have problems with the system i would stay with r-12 the replacements for 12 dont work and if you feel that you need a recharge of 12 try to find some virgin r-12 vacum the system and weight in the correct charge also i have found that insulating the evaptor box in the engine bay by the left rear of the engine by the headers will drop the evaptor temp some 10 to 20 degrees  i used some dyna mat good luck Brent

i am sorry i said left rear of engine i ment right rear of enginr :-) my bad

Hey Joe. If you go back into the past threads you will see there has been much conversation and opinions on this topic. My professional opinion is to go with what the system is designed for. If you still have R12 in the system you must not have a very big leak. Why mess around with changing over to anything else? R12 is available however pricy, but is your Vette worth doing it right?
Here's a chart to show composition of different blends.
http://www.epa.gov/ozone/snap/refrigerants/refblend.html

 Note, Freeze 12 is 80% 134A. Hot Shot is 1.5% Isobutane...............
Hope this helps. "T"

As 81 toy said,,try and find some real r12,,im in the ac business also,,the substitues dont work,,,,,

Dude, I wish I could help ya. I have a 30 pounder up here in Michigan. I bought it from an online auction. 

Where is the best, safe place to buy it?  I have it in my system, it just needs a re-charge.

guys check on ebay or biz rate just do a google search for r-12 and all kinda of options come up i seen many drums of 12 on ebay i would buy a big jug compared to a 12oz cans your systems probally hold about 2 3/4 to 3 lbs or freon just check the data tag on the evaptor housing i know it might be pricey and might not need that much this year but what about next year and the year after and so on r-12 will be harder to get as time goes by ps just be carefull not to get burned try and meet and chech the weight and empty 30 lb jug weights around 5 lb so a full jug should weight about  35 and so on and as a ac contractor i pay 30 a lb for mine good luck Brent

A drum is way more than I am will too spend right now.  Thanks for the info.  Drum will be a last resort.   Last time I recharged it, it lasted me years.  I don't drive the car a whole lot.