Air and moisture inside AC system?

Moisture

Moisture that enters the A/C system when is serviced or any component has been replaced will be harmful to the system and cause poor performance.

Moisture cannot be removed from the A/C system after charging the system with new refrigerant. Moisture that enters the A/C system will be harmful to the system and cause poor performance because of internal erosion and the possibility of the moisture turning to ice near the expansion valve.

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