Most often this is from the tires.
There may be three possible causes of fuel pump hum on a Ford Escape. These are the exhaust leak, wheel bearing, or a bad tire.
Electronic ballast does not hum as much as a choke. Minute hum of electronic ballast is the small inductor and capacitor producing an oscillation for high voltage generation,
it's just a POS
Suggestion: check the belt tentioner pully, if that's o.k. then try the fan clutch. i have a 2004 escape that did same thing it was due to having low power steering fluid
Bad wheel bearing, or more than likely a tire with a defect.AnswerIt's normal for a Tempo to hum.
Diya aur Baati hum
High-pass filters
A bad radio speaker
Because the person humming needed to breathe before they could start again.
Goldfrapp - Ooh La La
HUM
Hum?