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Return air vents.........
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AC VENTS are in the correct position if they are open and free flowing. Some systems have a heat and an AC position for the vents. The AC position is so the cool air discharges from the vents higher on the walls or from the dash rather than floor or windshield in a car.
If your problem is that the cold air stops blowing out the AC vents and transfer to the defrost or the heater vents, I have had this on my 99 Astro. There is a small vacuum line that runs from the Drive Side Valve Cover near the front across the front of the engine over the Air Conditioning components. If this line gets cracked or broken, when you are going up hill and the engine requires more vacuum for fuel there isn't enough vacuum to keep the Air blowing out the AC vents. Check the line for cracks or broken areas.
From the vents or from an AC line? If you're tracing your lines, and you feel heat coming off of the smaller lines, that's normal... refrigerants gets heated and superheated as it cycles.. the operation of AC is a series of heat exchanges.If you're getting it out of your vents, then there's a condition in your system which is preventing the AC system from providing sufficient cooling. It could be a number of reasons why, and AC diagnosis really isn't a do-it-yourself task.
My ac blows only in the defroster and not any of the other vents i have 98 ford windstar 3.8 v6
I have the same problem, and looking for answers. Please help!
Set the dual climate to the same temperature or turn the ac off, failing that open the other vents to lower the airflow.
It is called condensation.
My ac blows fine through the overhead, floor and side vents but intermittentely throught the front vents. What might be the cause?
The heater core is leaking coolant.
Your AC might be blowing out of dash vents on the windscreen as you might have turned the knob to that particular mode. It is also possible that the vent mechanism might be out of order or broken.