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A photo of the sight glass on the high side liquid line that should not always be used to determine if the refrigerant is full or low !!!... Far too many time i'v seen a beautiful full clean sight that someone has told me their mechanic or service adviser told them that their car a/c is full after they charge them for service or even worse yet they top off the gas until the glass was full. After it comes to me and I find it has 500g or 600g +in a system that should have only 420g to 480g and now a burnout compressor or poor preforming a/c . This is vary common, especially with the low life shops that use small cans! to fill the a/c.