I changed my sons A body to 134a, took off the compressor, drained the oil and refilled with new type, replaced the dryer and flushed everything else with AC solvent. It has been 2 years and even keeps him cold when he goes to Phoenix in August. I'm sorry, I forgot to mention I bought a retro kit from local parts house that came with all the nedded o rings and a bottle of oil. Philip
[This message has been edited by 64elcamino (edited 03-02-99).]