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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?
Any type of moisture including your breath.
I would have the alternator tested. If the alternator is over charging the battery then it is just cooking it.
It is low of refrigerant which means you have a leak that needs repair. After the repair the unit needs to be recharged.
the most common thing is a faulty multifunction switch.
Yes, but it would have to be defective already (which, at 12 years old, fits).
battery is low or almost dead