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With 4 cans you are probably overcharged. With r134a conversions I usually start at 50 percent of the R12 charge, then slowly charge til compressor stays engaged @2000 rpm & suction line is sweating all way back to compressor. If you have adequate airflow thru condensor it should work, although a parallel flow would be better for r134a. That switch in pic is a low pressure cutout for preventing evap freeze up, it can usually be adjusted for optimum performance. Brian
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