max a/c closes all the vents and recirculates the air in the cab to cool it more. i dont believe there is a change in fan motor speed.
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(Fortune Favors The Bold) Rwalker@Powerstroke.Org
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My unit isdoing that and it seems to be blowing on high...but the airflow doent seem to be as strong.....Maybe there is something clogging duct....is there afilter for this system to be changed.?thanks