I.A.C.
The I.A.C. valve appears to unscrew itself, causing it to not open because the spring keeps it closed. You have to remove it and screw the valve back in then reinstall it. If that don’t work replace the part. https://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_id=114&ipn=icep&toolid=20004&campid=5338081398&mpre=http%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_odkw%3Dsw-6350%26_osacat%3D0%26_from%3DR40%26_trksid%3Dp2045573.m570.l1313.TR0.TRC0.H0.X1999%2Boldsmobile%2Biac%2Bswitch.TRS0%26_nkw%3D1999%2Boldsmobile%2Biac%2Bswitch%26_sacat%3D0
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