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The evaporator is freezing up. Get a thermometer to stick in the dash outlet and that should confirm it - if the air temp drops much below 40 it's gonna freeze up. Why is it freezing? Incorrect charge level or a low pressure switch that's faulty and not kicking the compressor off.
Try driving it in the normal A/C mode (fresh air) instead of recirc - does it do the same thing?
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