For months we had a “Bad bearing” sound from the passenger side dash of our 2013 Expedition EL. I have thought that the bearings in the blower motor were going. Finally there is a louder noise and the AC and heater will not blow at all. It this the Blower motor gone bad? I am searching parts and the stores list a main blower, a HVAC blower with cage and a rear blower. Is there only one blower under the dash on the passenger side and another rear blower? Do you suggest an OEM Ford part or a reputable aftermarket part?