I think djhughs has it right– there should be a temperature sensor on the evaporator that will turn off the compressor if the evaporator gets too cold. If functioning properly, this will prevent ice-up. If the sensor fails, you’ll notice that the A/C slowly stops working as you drive, but will work again after it sits for a while (giving the ice a chance to melt.). Other symptoms you might notice are decreased airflow through the vents when the A/C is not working, increased blower noise and an unusually large puddle of water under the car from the evaporator drain after it has been sitting for a while. (the puddle is from all the ice melting away). The solution is usually to replace the sensor, but it’s always a good idea to check wiring as well.
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