 humming noise when cruising
I have a 1999 Escort with 2.0 SOHC. It has 101,000 miles and it's makes a humm noise when i am cruising down the road. The faster i go the louder it gets. I brought the tires around two years ago and the were always like that noisy. I am wondering if this is tire noise or bearing noise . I am also going to rotate the tires to see if i hear any difference. So ,any reponse will be appreciated. | 
