My wife has a 2014 Front Wheel drive Ford Escape with the 1.6 liter Ecoboost engine.
the vehicle was purchased new in October 2013 and has 32,600 miles on the odometer.
one week ago after a scheduled oil change and tire rotation, the vehicle started making a humming noise from about 15 mph to about 80mph. The noise varies with vehicle speed in frequency and is a constant drone type noise at constant speed.
At lower speeds, it sounds like a bicycle with a baseball card attached to the fender rail, that hits the bike spoke to create a noise when we were kids. I just don't understand what is going on/
I checked the tires for nails and punctures and they are all right even though they are the original, 20" wheels.
Does anyone have any ideas what could be causing this noise, that seems to come from the back of the vehicle?