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Check for vacuum leaks. Common problem is the line that comes from the engine into the cabin of the car. It gets hard and brittle and cracks, then no vacuum to power the vent actuator pods.
the actuator to the defrost door is inop. try running the climate system thru all the modes ac heat defrost vent off etc, maybe it will begin operating . look for any vacuum leaks
Almost sounds like your climate control switch is bad as it controls everything including the switching and blower speed with the exception of the blower speed being a blower resistor issue (allows multiple speeds).
Most likely is your blend door is faulty (bad motor/broken tab?). Defrost is the idle possition ( as it is the most important). You may have a disconnected vacuum hose from the climate controle panel if you recently (ever?) had work done in the dash area... But my suspicion is the blend door motor...
Check your vacuum pump located on the right side fenderwell. see if its running. Check the vacuum hose at the hubs for leaks or damage. repair if damaged. check for other vacuum leaks such as the grey hose going to the heater control valve.
It could be either..but most likely electrical.....the door motor may be bad or the head unti( a/c heat panel) could be bad or have a bad switch in it.
You probably have a vacuum leak in the hoses connecting to Temp Control switch. Remove it carefully and inspect. Those things have mini -O rings sometimes. Any leak in any of the hoses and things go kaput. Check to make sure no leaks in the diaphram also.
As for the person with heat in the rear only, you need to check to see if the door is closing and opening. Not sure if yours is also motor control. If motor control replace the motor that operates the door. Is probably stuck in the hot position. But before you spend money ensure there isn't debris keeping the door from operating.
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