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Re: Lots air and heat, but won't blow out defrost by wind...
Similar problem on my Saturn, the air control knob is the slider above the temperature slide, it is a lever attached to a wire. It moves the vane to redirect the air, if it will not move then something is blocking the vane or the cable is jammed. If it slides back and forth without any effort then the cable as come disconnected inside. Purchase a service guide and it will explain how to remove the controls and check. It will also show where the cable attaches to the ductwork behind the dash.
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How long have you been driving or owned a car? Your A/C is set on front "defrost" instead of main. Turn off the defroster for the front and select the switch to read "main" or if your A/C panel uses icons to display, press the one where it looks like the airflow is blowing air (represented by arrows) towards you and not the windshield. The arrows on your buttons or electronic display refer to which way the air is flowing. Choose the one you want where the arrows show the airflow is blowing out towards you and/or turn off your defroster. (If you have a knob to select airflow, turn it so it is no longer on "defrost" and it points to the main airflow blowing outward).
Defrost has been stronger on all types. Just the way plenums are made. Clear that wind shield first. As long as you have plenty of heat to keep the cabin area warm to hot, it's OK. I wouldn't woory about it.
To clarify, the compressor and fan will run in defrost mode. The compressor and fan runs to dry out the air blowing onto the windshield.
Now if the condenser fan runs in "heat" you may have a problem with the fan relay or the main controller.
You do not mention the type of car you have. If you have air that blows out the defroster and panel vents you should have defrost. Do you smell a sweet odor coming from the car? This could be antifreeze leaking though the heater core. This will cause your windshield to remain foggy.
That seems pretty normal, the heater works by blowing excess heat from the engine coolant. So the coolant has to be warmed completely for the heat to work, you can get a heater that plugs into your cigarette lighter that will heat the vehicle instantly.
it will still blow air on your windshield but the reason the ac comes on is to blow dry air on your wind shield, potentially a cold windshield and damp air could make problems worse. but ive been in the situation before it still works with no noticable difference most of the time