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2011 Ford F-250 Super Duty Question: Why do I only have air flow from the dash vents no matter which mode I choose?

 

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Diesel Cecil, 6.7L V8 Diesel Turbo, Hurricane, WV, January 09, 2014, 21:00
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Can't get air from all modes only the dash vents, wondered if cold weather was a factor but I verified that was not the fact. Is it a vacuum concern or a sticking blend door?

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