The level of vacuum produced in the system with the Uview tool is not affected by the amount of remaining coolant in the system; it is a function of the level of airflow available from the compressor used, and how tight the cooling system is. The bigger question that needs to be asked is did it hold 20 inches of vacuum for at least 5 min. before you opened the valve to fill the system? If not, you may have had a coolant system leak, which kept the system from reaching maximum vacuum.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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