The front seat vents My 2017 Expedition EL Platinum are not producing any air flow other than outside air when the vehicle is in motion. When there is air flow due to the vehicle being in motion, the air is cold when the A/C is on but the fan is not blowing and I can't redirect airflow from the lower vents to the dash vents or the defroster. The rear fan works well and cools the back of the vehicle. This problem occasionally will stop and the dash fan works well and I can select the different vent settings The Vacuum hoses appear to be in good shape in the engine compartment.