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Re: 1972 GMC Sierra grande secret door?
If you have AC, the one on the passenger's side gets used for recirculation. Vacuum opens the vent on the kickpanel, and closes a door in the cowl area so the HVAC fan pulls from the kick panel rather than the cowl area. Really interesting to see it all in action.
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1970 C20 Custom Camper - 350, TH350
1997 GMC Suburban
1994 Acura Integra GSR
1987 Dodge Daytona Shelby Z
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