How do I add R22 refrigerant to my air conditioner?

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1 Turn on the air-conditioning system. Turn the thermostat to its coolest setting. 2 Remove the caps covering the outside AC unit’s R-22 refrigerant valves. These are found on the pipes entering the outside unit. 3 Screw an R-22 manifold gauge’s left-hand hose onto the valve on the large refrigerant pipe. … More items…

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