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Q: where is the maintenance port for the a/c recharge? on 1990 Audi 100

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I looked online but couldn't find a simple illustration of the engine with lined labels or something similar.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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One is on the low pressure side line the other is on the high pressure side line. Check by condensor, might be hidden by grille.
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