I think it takes 3.5 lbs. from full evacuation. I have a 20lb. cylinder. From the time I sold my '68 an older gentlemen in 2001 and bought it back from him several years ago he had converted it to 134A and it is definitely not as efficient.
I need to contact him to see if he only evacuated and recharged. IF that is all he did I will likely put the R-12 back in it since I have it. The prices for it are crazy...
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Good Judgement comes from Experience. Some Experience comes from Bad Judgement" Albert Einstein
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