Although I feel sorry for this guy, this was all because he wanted to save a few bucks on refrigerant.

R12 is STILL available, although expensive, it is what that air conditioner was designed to use. You don't have to replace R12 unless it leaks out. If it leaks out, then something has to be fixed to prevent further leakage. That SOMETHING typically is much more expensive than the R12. Why not spend a few more bucks and put in the R12? You will be safer, your engine will be safer and you will be comfortable while driving. If you have done a good repair job, you very well could be comfortable for the life of the car.

I remember my Grand Dad always saying about my Dad that he "spent dollars to pinch pennies." This definitely applies here.

If you drive a car that originally came with R12, most others who do will not be driving it for long. This means the demand should go down, thus the price should continue to go down. Just use the right stuff, be safe, comfortable and happy.

Good luck,