sunbeam - I believe what you may have been feeling was what we called in the automotive (design / manufacturing) industry, "bleeding."
You'll notice nice cool, air conditioned air (for a while) if you have been running the A/C for a while, in FRESH mode, then push the OFF button while rolling down the road.
The pressure differential between outside and inside the car, plus the fact that the hvac vent is open in the FRESH position, air will still come in, and move through the car (then drawn out). The evaporator remains full of cold refrigerant ... for a while. That refrigerant doesn't stay cold for too long down here in the south where we keep the roofs blazing. When I lived in Michigan, it would bleed in nice cold air across that evaporator for quite a while.
Come to a stop in this condition and the bleeding stops. Course you can turn the car to ON, set the HVAC fan speed to any speed really, then press the OFF button on the HVAC. The fan will stop. You can readily hear it if the car is ON but the engine is not running.
7milesout
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 50.9 mpg (Imp)