All these newer cars are all controlled electronically not vacuum, there is a broken gear that doesn't move the gear that throws it into defrost.
it is BULL though in the older cars that used vac lines if something went wrong it would default to defrost because its a safety issue.
new cars suck. The dash has to come out there is not enough room to access it to repair it.
You have a "mode" actuator problem, whether it is the mode control switch or the motor will take special testing.
SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR
Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.
SOURCE: Heat wont blow through heater or defroster vents
common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.
SOURCE: ac will not blow thru ac vents, only thru defrost vents.
if vent doors are operated by vacuum check for loose or broken vacuum hoses in the engine compartment , or check the fuse box for any ac/heat fuses if it is a electricaly controoled system
SOURCE: All Air Conditioning blows our the defrost vents
Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.
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