What causes air flow inside the cab to stop blowing towards the floor?

Blazer 4x4 Vacuum Diagram

What causes air flow inside the cab to stop blowing towards the floor? Need vacuum diagram for 1994 s10 blazer 4.3 w cpi.automatic 4x4 need to

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Classic Blazer 4x4 Issues - Page 3 - Blazer Forum - Chevy Blazer Forums

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What causes air flow inside the cab to stop blowing towards the floor?
What causes air flow inside the cab to stop blowing towards the floor?

Need vacuum diagram for 1994 s10 blazer 4.3 W cpi.automatic 4x4 need to
Need vacuum diagram for 1994 s10 blazer 4.3 W cpi.automatic 4x4 need to

Classic Blazer 4x4 Issues - Page 3 - Blazer Forum - Chevy Blazer Forums
Classic Blazer 4x4 Issues - Page 3 - Blazer Forum - Chevy Blazer Forums

Need help with finding vaccum line diagram - Blazer Forum - Chevy
Need help with finding vaccum line diagram - Blazer Forum - Chevy

vacuum lines - Blazer Forum - Chevy Blazer Forums
vacuum lines - Blazer Forum - Chevy Blazer Forums

1989 Chevy Blazer 4x4 Vaccum: When 4x4 Is Engauged, There Is
1989 Chevy Blazer 4x4 Vaccum: When 4x4 Is Engauged, There Is