Either you have the air vents in the "recirculate" position - which simply means you are pushing the same air around the vehicle and not drawing any fresh air from the outside - or you have a blown heater core.
Does it quit shaking when it warms up? What engine and year of Aerostar?
well it could be because of the heat. if its cold out and you have the heat on in the car, then you will get hot and that will cause the window to fog.
The fuel cut off switch is bad! Replace it
The back up light switch on the 1994 Ford Aerostar is located on the side of the transmission. To remove it the wires must first be unplugged. Next the all screws must be removed.
heater core is going bad.
21 gal. probably, full it up and see.
Do you mean a ford aerostar?
moisture from your breathing for example condensing on the cold glass
check owners manual i think its a bad design in which this model requires the a/c to be on at all times that the defroster/defogger is on, otherwise the windows will fog up this is horrible while its rain during warm weather
It is called condensation, warm and humid inside, cooler outside.
Two people, breathing heavily. There's a lot of water vapor in your breath, and when two people are going at it they breathe a lot more causing more water. If it's cold outside, the windows fog up like crazy.
If the heater core is ok, check to insure your ac unit is working. The ac works in conjunction with the heat when running defrost, and without the ac air windows will fog up .