if you mean the rear vent window it could be a loose wire if you have power and ground then the window motor is bad
Any type of moisture including your breath.
Having it on "PARKING"
vacuum leak
A serious vacuum leak could cause that.
When I bought my ford windstar it was used and later discovered the sway bar needed replacing. I am not saying that this is your problem but it is worth checking out also check you motor mounts, tires.
Diod you check front brake pads
Maybe a head gasket?
If that doesn't work, you may have to take the door trim pad off and lube the linkage inside the door.
I would have the alternator tested. If the alternator is over charging the battery then it is just cooking it.
Exhaust leaks close to the engine.
the most common thing is a faulty multifunction switch.
Yes, but it would have to be defective already (which, at 12 years old, fits).