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My guess is you have a vacuum line problem under the hood. When the vacuum supply is cut off the system reverts to it's default position which is floor and defroster. Check under the hood for a vacuum line that is disconnected, pinched, collapsed, cracked etc. A common place for a vacuum line to disconnect would be at the vacuum reservoir. This is the black plastic ball that is attached to the under side of the hood above the brake master cylinder.

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Q: Why is your 1997 Chevy s10 onlt blowing air from the floor and defroster?
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