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Looks like the low pressure port, which typically has a black or blue cap with an "L" on it.
 

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95 Alfa 164 ls, 07 Quattroporte exec. 07 Santa Fe.
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There may have been a previous attempt to charge up the a/c or cap was lost during a service. Cover it up with a proper cap or anything that will keep out moisture and dirt. Trying to add refrigerant through a dirty port can introduce contaminants into your system.
 
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