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Ok, you will add the refrigerent to the low pressure side. The low pressure port is located on the ac line going into the accumulator(#1 in below diagram). Its about 6" before the accumulator. If you look close at the diagram, you will see a port sticking out from the line just before the accumulator.
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You turn the engine on and turn ac on. connect hose from the refrigerent can to the low pressure port and open the valve on the can. Turn can upside down while adding refrigerent to system
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