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The control of vents on the Third Generation Camaro's is done with vaccum rather than via cable or electrical means. The problem is being caused by a vaccum leak either at the control unit or somewhere along the vaccum source line. Best check for leaks on both side of the firewall. Also, the control unit may need to be replaced.

My Camaro had the exact same problem and it was a vacuum hose leak.

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13y ago
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Q: Air conditioning on 1992 Camaro only blows air out of defrost?
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