Blower is working on all speeds and heat works on floor and defrost. A/C does not blow any air from dash vent it come our of defrost and floor and rear back seat vents.
I'd think that the vent adjuster knob/slider is not working correctly strip out the heater panel around the control knobs and check the vent direction is working properly either stiff operation so a little wd40 on the cable would probably do the trick or some thing causing the vent itself to not move
SOURCE: 1998 Mustang - AC blows only through Defrost vents
You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.
SOURCE: Vent control
You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.
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: 2001 F-350 V10 4 door
Exactly!! Follow the vacuum line , I believe to be on the right side of the truck, and follow it back to the engine. I'll be willing to bet you will find a break or a modification where a mechanic has hooked it to the wrong port. Now it is also possible for this engine to have a one way check valve installed in line with the vacuum line. Look under the hood for any diagram since the vacuum lines on these newer models will be minimal. Let me know.
SOURCE: ac vents not working
There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,
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