The HVAC selector is vacuum controlled. Sounds like you might have snagged a vacuum tube and pulled it from the connector when you slid the head unit in. Should be an easy fix.
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2 Red Tours!
'96 GL V6 ATX - the wifes ride
'98 SVT with both options - my toy!
OF's TH fix / K&N / Glove Box Light / an dats it!
