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Check your Air Conditioning / Heater Vacuum Check Valve. It located under the passenger side fuel rail cover. This plastic part break apart because of the heat of the engine over time. The vacuum tubes probably are just hanging next to this valve. I had this same problem and this was the part in question.

2008-04-07 15:17:24
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Q: Why does no ac air blow through the dash vents on your 1994 corvette Air only comes out via the floor or the windshield?
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