A/C system restriction.
LAMBORGHINI MIURA 
LAMBORGHINI MIURA
Symptoms of a restricted orifice tube.
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.
Tags: ac system compressor debris, ac system contamination, clogged up condenser, flush ac system, restricted expansion device