Ford stopped using actual filters on the Explorer and Taurus and when you go to buy a new filter, its just a plastic grate. Not sure if our Fusions have filters, I recall the intake not being designed correctly causing it to recirculate the heat from the peltierHi CG. How many miles on your Fusion Sport? Assuming the cooled/ventilated eats in the Fusion have filters, have you replaced the seat filters (if you at at/past the required mileage)? If you are up in mileage, the filters may be clogged.