The rain sensor has water on it and "thinks it's raining" so it's closing the vent the way it was programmed.
Remove the inside plastic trim ring, use a hair dryer ON COOL to blow air across the rain sensor to dry it out, then push the button again. It should work like new. If so, replace the trim ring, if not, blow more air over the rain sensor.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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