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3 Cans is about par. If you are serious about converting the system then you do not want to mix anything R-12 and R-134a. They use different oils and in the case of PAG oil it does NOT mix with the mineral oil used orginally with R-12. The other major concern is o-rings. You need to replace all your o-rings or your system will slowly leak out the r-134a. You need o-rings specific to your type of system. Since you will have the system apart it is also best to flush the evaporator and condensor with varsol or other solvent to get out all the oil and to drain the compressor completely. Put in the recommended amount of oil in the compressor. Then re-assemble all your lines with new o-rings and a new dryer. After you are done you can pull a vacuum and then leave it for a couple of days. If you did everything right when you recheck it in a couple of days it should still be holding a vacuum. If it is you can start charging the system with R-134a. You need to go up to at least 35 PSI though I think it cools better with 40 PSI. Put a thermometer in the vent and check you temp it should be around 40-50 degrees.
Mike
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