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Stone,
I just converted my Bj70 from R12 to R134a it was farely cheap ($40 USD) and took all of 1 hour at the most. Evacuating your old R12 is the most costly thing (if you do it like you are supposed to) other than that the conversion consistes of two new adapters that hook on to the low and high side valves and recharging the system with R134a/oil.
My system was kind of strange it had 65lbs, clutch worked and everthing, however only blew warm air. I evacuated the system after putting on new valves then charged the system and everything worked great, very cold air now.
I did notice as I was charging the system that the pressure switch to activate the compressor is set pretty high mine was between 58-62 to activate, so even though the R134A likes it around 40-45lbs I am running 60 and it works great.
One more thing, I have heard of issues with R134A begin overcharged and if overcharged you will not get cold air either, but I have not heard of that with R12 systems. If you mix R134a with R12 I think the system will not work as well from what I have heard.
Good Luck,
Michael
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