Larry,

I spoke to an ac man yeaterday and he recommended staying with the r12 if the system is salvagable. I think I will take his advice on both my slc and the 300d. The slc system works but probably needs recharging. I rarely use ac when I drive even on the hottest day (the world is full of masochists), but my wife, who is from N. Calif., requires ac. The 300d system doesn't work but I think I will stay with r12 again unless it is toast.