A/C
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A reputable A/C service mechanic will first check the R134a state of charge. They usually connect a roughing pump to the A/C system to pump it down to hard vacum, then do a drop test under vacum. This also removes any non-condensable gases from the system. Once strenght & tightness (air tight integrity) of the system is established, they should re-fill with a specified amount of compressor oil & refrigerant R134a.
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Originally Posted by markwb
A reputable A/C service mechanic will first check the R134a state of charge. They usually connect a roughing pump to the A/C system to pump it down to hard vacum, then do a drop test under vacum. This also removes any non-condensable gases from the system. Once strenght & tightness (air tight integrity) of the system is established, they should re-fill with a specified amount of compressor oil & refrigerant R134a.