About 80% of the amount of R-12 that was originally "spec'ed". (Sorry, I don't know that figure!)
As you add refrigerant, the system will start to cool.
The large (suction) line leaving the evaporator will be at ambient temp. As you add R-134, the line will eventually start to cool. When this happens, you are getting close to the correct charge. If you continue to add refrigerant, eventually, the suction line will be cool and have condensation all the way to the compressor.
Charge it beyond the condensation getting CLOSE to the compressor, and you risk liquid getting into the compressor and breaking things.
I tend to UNDERCHARGE these sytems a bit, as the compressor is already working harder than originally, since R-134 runs a higher "head pressure" for a given condensor temperature.
I feel that a systeem cooling at perhaps 90% of capacity is better than trying for 100%-plus, and blowing a line or a compressor.
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