2011 Ford F-250 Super Duty Q&A

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

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? -
Answer 1
Selector control switch could have failed, you would want to have it checked out... -
Answer 2
poss warranty at dealer -
Comment 1
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 -
Answer 3
unknown problem -