about 90% of the time, my 2002 Acura TL Type S, 120k miles makes a humming noise at the front left of the car around 75-80 mph. Doesn't make the sound slower or faster than that range of speed. I have taken the car to 3 different repair shops and all say that there is nothing wrong, everything is tight and as it should be under the car. I'm at a loss, i know something is wrong but nobody can tell me what it is. Here is a link to a video of the noise that it makes, note that that is not the engine.

 

have you tried rotating tires to see if it goes away? Typical humming noises are bearings.

 

YEah i did, i rotated and balanced them but its still there. THe mechanic told me that wheel bearings are ok.

 

was he an acura specialist?
was a stethascope used to listen to cv and hub bearings?
were the wheels in motion with car on a lift?

find another mechanic!!

 

Wheel bearings are usually most noticeable at 35 -40 mph. At 80 mph I'd be looking for anything that would be affected by wind. Do you have a roof rack? Any loose body trim or door seals? Underbody shielding all intact and secure? Wiper arms/blades?

 

So update with the car, i took it to the dealership on sat. and they kept my car on monday only to tell me that they can't replicate the noise, that everything is fine around the car, and that they can't find the issue. Not even the dealership can find the issue. I'm screwed

 

Quick update, it was a sealing on a molding on the driver side of the windshield >.> I feel stupid. But at least its was fixed.

 

My accord has the same humming noise. Search google on accord trans whinning for this symptom. You are sure it is nothing to do with the electrical and stereo system, right?