With the high cost of getting an R-12 system serviced, a 20 lb cannister
could be worth $500 or more. The change to R-134 was made in 1994. Most AC
systems if regularly used will hold the refrigerant indefinitely. The AC
may work without any service for 20 or 30 years. AC systems designed for
R-12 will last the longest if they are used weekly for a few minutes and the
R-12 is topped off when necessary.


"Tom Howlin" > wrote in message
news
> This is more out of curiosity than anything else. I just had a friend
> purge and refill my AC on the 92 with R-12. He has seven twenty pound
> cannisters of the R-12 that he bought many years ago when they started to
> phase it out. I was thinking about trying to buy one from him for the
> local Miata guys that are still running R-12 but have no idea how much one
> of these is worth these days. I do know I wish I had thought of
> stockpiling it myself. Any ideas on what a fair price would be for one?
> Thanks.
>
> Tom
> 92 Red
>