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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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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