Air worked great for about three days after I bought my 90 'Burb. Then it died. Specifically, the compressor (R-12) died. I replaced the compressor and filled the system with R-34 b/c the R-12 is so expnsive. I also replaced the accumulator (I think that's what its called). The front air blows cool, but not cold like it did before. I wrote this off to the R-34 instead of R-12. The rear air, which was not touched in the process, blows hot. It blows, just is not getting cool at all. Its 85 degrees today and takes a long time to get the 'Burb to cool down. Anyone have any idea what may be causing the rear A/C to be out? While on the topic, any idea how to make the front A/C cooler.