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the windscreen fog is from humid air coming in from the outside
air conditioners work by removing the humidity from the air so if you close of the outside vent then the recirculated air inside the cabin eventually has all the moisture removed
that is why the windscreen clears because there is no moist air to condense on the cold windscreen
now you will say that it is too cold and that is why you turn it off
well try this -- leave the ac on and adjust the heater control to produce lukewarm air no fogging up and not cold
it is called climate control
air for the inside of the car comes from the vent at the base of the windscreen or is recirculated inside the car
if you see what appears to be mist, fog or smoke from the ac vents ,it is extra cold air from the ac system that is seen as fog when it hits the air in the car
you will know exhaust fumes by the smell
What make an model an year vehicle do you have ? The air blows out of the floor vents an center vents but not defrost ? Possible mode actuator , stuck mode door ! There is a door inside the heater / A/C assembly that directs the air to the desired position . These doors can be moved by a vacuum operated actuator or an electric motor . Sometimes thing's put on the dash end up inside the heater box , fall through defroster vent ! Pens , pencils etc.. Depends on the make vehicle an system , manual , or automatic climate control . Some of the newer vehicles the HVAC system as it is called , the control panel is a electronic control module an can store DTC'S - diagnostic trouble codes !
Vents are vacuum operated. The vacuum line from the engine to the controller is broken some where. They usually break by the engine. Easy to repair. Some times the break in the harness. I just run a new hose to the controller. You may have to drill a hole in the firewall to get it there.
clean out the drain under the windscreen and ensure that the drain hoses down inside the mudguards are not blocked . ON the dash controls close the vent to recirculate the cab air and not allow fresh air into the cab.
UNDO THE SCREWS FOR THE GLOVEBOX LIFT OUT THE WAY AND ON YOUR RIGHT HANDSIDE YOU WILL SEE 3 AIR DISTRIBUTION FLAP MOTORS ,THE ONE FOR THE WINDSCREEN IS THE NEAREST TO THE BULKHEAD. YOU CAN TEST THE BLOWERS AND YOU WILL SEE THE MOTOR VENTS WORKING OR THE ONE NOT WORKING IN YOUR CASE ..
does the heater blow on different setting? i.e into the cabin?
if it does check the hose at the back of the dash hasnt come off and is stopping airflow to windscreen.
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