Stuck on defrost and won't switch to vents or floor. Any help would be great. Thanks

There are two types of controllers for vents. Vacuum and electronic. Losing vacuum results in being stuck on defrost. So I will assume your's is electronic. First you will have to check to see if you have power and ground to the controller. A volt/ohm meter will check this. If you have both, then I would say the controller is bad.

it could be a bad switch... it could also be leaking vacum lines (vacum is what operates the dirictional doors). it could be a stuck door, or bad hinge. it could also be loose ducts underneath the dash.

On a 1996 model you probably have vac actuators that control air flow. Look under the dash and you may be able to see the actuator that controls flow to the defrost and vents. There would be another one for temp control.

I think the flaps are sticking

I know a 2007 had problems. Does fan work on all speeds. If not the blower resister. If it works on all speeds then actuator in dash

If you are referring to the air won't blow through the defrost vents or on the floor, you may have a stuck or broken blend door actuator. This part diverts air through the different settings: defrost, vent, floor etc. If you aren't getting warm or hot air regardless of the settings, you may either be low on coolant or have a bad thermostat.

The heater blend door actuator (motor) is faulty.Replace actuator

I am guessing here as I don't know which control unit you have, but I believe you may have the one like in the video and the video shows the repair you will need to make. Hope it helps.

Sounds like you need a blower door acuator motor, which moves to direct the heat to where you want it to be

I found a broken vacuum hose on top of the intake which runs the controls