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Suspect a defective blend door actuator motor that controls airflow for the defrost. This electric motor may be defective and in some makes and models can be extremely difficult/expensive laborwise to replace
Is the gauge showing the engine is warming up to normal temp ? Are the heater hoses getting hot ? If the heater core is getting hot, it could be a blend door problem. The blend doors direct air thru the heater core and the ac evaporator among other things.
Sounds like you have a problem with your blend door in your air distribution box behind the dash. Somebody needs to get in there and figure out why it won't switch from defrost to the vents or floor setting.
check for a vacuum leak in the hose going to the heater controls. Goes from engine compartment, through firewall, into dash to control head. Also, has a vacuum storage canister under hood. When system fails, it defaults to defrost.
Does it still blow out the floor and defrost when you set the switch to those positions or does it alway blow out the defrost no matter what? If you can get air to blow out to the floor, then it sounds like you lost the switch that controls the airflow to the vents. If it only blows out the defrost, then you probably lost the vacuum to all of the switches. When the vacuum is lost, it will only blow out the defrost. Check the smallest line on the vacuum distribution block located in the corner near the brake master cyclinder. That line provides the vacuum to control the direction of airflow within the cabin.
The air temp control blend door is inop, it may be electric or driven by engine vaccum, but either way this is the problem to fix. I suspect yours is vaccum since more than one function is not working, temp control and air distribution, i.e. floor, defrost and dash vents