91N/A ac recirculation light blinks then no light, ac blows cold still

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Hi all, a while back i had noticed a problem with the a/c recirculation button. It would all of a sudden blink continuously until one day it stopped blinking all together. Any idea what this means? The a/c blows cold with no problems and when i switch it back and forth from recirculating air it seems to switch fine. I was just curious to know what the problem is just in case it leads to other problems. thanks!:)