Abstract: A method and apparatus for controlling air flow into a cabin of a vehicle. The apparatus includes a valve controlling the proportion of fresh air and recirculated air admitted to the cabin, a ventilation fan, and a control module. The control module determines that the full fresh position is selected, detects a fan voltage selected to correspond to a desired air flow rate into the cabin, determines that an expected air flow rate into the cabin at an actual vehicle speed is greater than a desired air flow rate, and causes an actual air flow rate to match the desired air flow rate. The match between desired and actual air flow rates is achieved by maintaining the selected fan voltage and moving the valve to an intermediate position between the full fresh position and the full recirc position.