You need to have it vacuumed down and checked for leaks if its low its probably gotta leak
Look for the larger A/C line going to your compressor, thats the low side line that you will find the fitting to add freon
SOURCE: can't find where to put
1996 Audi A6 Quattro
Note:
Only a high pressure service valve is used for A/C system servicing. A low pressure service valve is not installed. Perform all A/C system service (ie. discharging, evacuating and charging) through the high pressure service valve only.
Oil pressure switch on upper oil pan===
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