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To perfectly check your AC level you need to understand the components that makes up the unit such as compressor, condenser, evaporator. But the simplest method is to check if the air coming out from dash vent inside the car is cold, Another method is compressor clutch engagement method, if the compressor clutch does not engage it mean there is low refrigerant but also note it another issue could be responsible for this. The other method is to use of gauge to check the air pressure from compressor but this needs a more expertise experience. 
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