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Most everyone is going to need to evacuate the system if they plan to be successful with charging in the future.
It is all about the weight with the variable displacement compressors being used today, and pressure charts will not help as the pressure will be all over the place. System capacity has now also dropped below 12oz of refrigerant, with very little tolerance +/-.
The chart above is junk, if you follow it, you risk blowing up your system.
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83 944
91 FJ80
84 Ram Charger (now gone)
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