There are 2 ports, the low pressure side is larger in diameter, and that is where you attach the freon container.
The thinner hose is the high pressure side, and is not where you add freon, but only attach a gauge.
Wear eye protection.
Locate the receiver/dryer, after the condenser.
It is a cylinder with a small glass port at the top.
With the engine running, add freon until you no longer see bubbles in this sight glass. But do not add more than that or you could blow the pump on liquid.
You can put the freon can in a bowl of warm water as it slowly is sucked in and ices up.
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