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theres 3 or 4 vacuum lines that run to the heater box and pulling vacuum on certain ones opens and closes the flaps inside of it. Default mode (no vacuum) is defrost mode.
Sounds like the lines off the back of the controls arent connected correctly
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
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