Cannot get any air through the windscreen vents.Air will come through the dashboard vents but when you use the rotary switch to change the flow nothing happens, fan speed works fine, hot air takes an age to come on i assume this is only heat from the engine?
Sounds like the flaps on the heater box are not moving. you will need to check the cables to see if they have come off or if they are seized.
The heat problem could be a blockage in the heater matrix. Try flushing the matrix out with a hose from the engine compartment side.
Note: you will need to bleed the system of air after doing this.
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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 !
The first thing I would check is the blend door actuator. This is located under the dashboard towards the center, move the controls while looking underneath so that you can locate it. Once you locate it call the dealer for the replacement part before you take this one out.
There are controls on dash to select position of air you want to, like front only, windscreen, below dash etc, check those. If still there is problem you need to remove the dashboard and most probably the flap which redirect air has got its cable snapped. Another possibility is the air hose inside dash are loose.
There is only one door. Air flows through the AC evaporator and the blend door diverts some or all of the flow through the heater core. For heat, the compressor is off under electric control and the non-refrigerated air is diverted through the heater core. The door is on a vertical axis and can swing to any position based on random corner turns, fan speed, mode, etc.
sounds like you have a heater core thats leaking this is located under dash and if it is leaking it will cause widows to fog up is that a posibility check to see the level of the engine coolant but make shure that engine is cooled off before removing rad cap because its under pressure good luck