yes, it should hold after its off. thats what that little vacuum accumulator ball is for. So when you say floor it up a hill with the heat on, they air will still come out your vents.
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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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