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

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?

by in Hurricane, WV on January 09, 2014
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3 answers 2 comments
ANSWER by , January 10, 2014
Selector control switch could have failed, you would want to have it checked out...
ANSWER by , January 10, 2014
poss warranty at dealer
COMMENT by , January 10, 2014
check the blend door to see if the heater box is broken ,fords are famous for this,also check to see if the actuator is working
COMMENT by , January 10, 2014
Mode door!
ANSWER by , October 13, 2014
unknown problem