Water Content
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Only very small amounts of water are soluble in liquid refrigerant. On the other hand, refrigerant vapor and water vapor mix in any ratio.
Any water in the refrigerant circuit will be entrained in the form of droplets once the dryer in the fluid or collecting container has absorbed approximately 7 grams of water. This water flows up to the expansion valve nozzle or restrictor and turns to ice, and the A/C system no longer has a cooling effect.
Water destroys the A/C system, because it forms acids when combined with other contaminants at high pressures and temperatures.