A/C system restriction.
A restricted orifice tube would cause a lower than normal low-side pressure. A restricted orifice tube may cause frosting of the tube. The restriction will cause a greater than normal pressure drop that can lead to the refrigerant vaporizing at that point .Vaporization of the refrigerant will produce cold enough temperatures to cause frosting.
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Tags: ac system compressor debris, ac system contamination, clogged up condenser, flush ac system, restricted expansion device