Typically, on days when the humidity is high and the temperature isn't too extreme, people will run the A/C on low fan speed (to reduce noise). If the humidity is high enough to cause excess condensation on the evaporator coils, that moisture will collect and freeze, effectively blocking the airflow. There's a "freeze plug" detector inserted in the evaporator, usually about 1/3 of the way from the top. It's connected to the control box and if it senses icing, it will idle the compressor for a bit (until the temperature rises enough at the evaporator) to prevent icing. Sometimes, just running the fan on low is enough restriction to cause icing. Sometimes shutting a vent or two will cause the problem and sometimes the freeze plug will fall (or vibrate) out of the evaporator coils and fail to detect icing. When that happens, the compressor "chugs along" until the evaporator is completely frozen over and all airflow stops.
It sounds like you may be experiencing one of those situations. My guess would be the limited airflow from closed vents. You should know in an hour or so.... Let us know how it goes.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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