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Next, you'll want to start the car and turn the AC system to its maximum cooling setting. This will help ensure that the refrigerant is properly distributed throughout the system. With the engine running and the AC on, hold the can of refrigerant upside down and slowly open the valve on the recharge hose

crc ac charge refrigerant r134a refill & hose. You should see the gauge on the hose start to rise as the refrigerant is being added to the system.