that is the a/c line and there is a fitting under the black cap to refill the a/c. i forget the proper name for it.
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Alero is gone but not forgotten
1999 black gls coupe R.I.P 130k
1999 auburn mist metallic gls sedan R.I.P
2005 Subaru legacy 2.5i 190k. New rims and tires for summer.
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