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1997 Mercury Villager Question: What is this part ?

 

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dave1997, 3.0L V6, Lancaster, OH, June 21, 2012, 07:08
 Rookie

There is a small uneven hole in a cap on a part attached to the side of the compressor.Maybe it's a relief valve? We charged the ac system and it worked for a day or so. Can anybody tell me what this is?

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