What action should be taken when excessive moisture is found in a system?

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Moisture in a refrigerant system causes problems like acid formation, oil hydrolysis, and corrosion, and it can freeze and clog metering devices. The only reliable way to remove moisture is to evacuate the system with a vacuum pump, pulling a deep vacuum to draw out water vapor, air, and noncondensables. Once the vacuum is stable and the moisture has been removed, you can properly recharge the system with refrigerant (and replace the dryer if it has become saturated with moisture). Simply recharging without evacuating would leave water in the system and lead to ongoing performance issues. Inspecting alone won’t remove the moisture, and replacing components isn’t automatically required unless there is damage or contamination beyond dehydration. Evacuation ensures the system is dry before recharge, making it the correct action when excessive moisture is found.