AC

[Mark Denovich <mark@domain.elided>]

You can convert from R-12 to R-134a rather easily...   You'll still need 
to go to an AC shop to have them recover any remaining R-12, and you 
should pull a vacuum on the system to remove any moisture.   It's really 
important to get any moisture out as the oils (PAG or POE) used in 
R-134a won't help prevent corrosion like the R-12 mineral oils.

The other bad news is that you'll only get about 80-90% of the cooling 
from your system compared to R-12.

You may want to try a R-12 replacement... www.autofrost.com

The only problem, is it's not DIY, you need to be EPA SNAP approved to 
buy/install it (even though it's ozone safe.)

	--Mark
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