Dear Folks,

I am feeling Humming noise more inside cabin. Video is attached. It is clearer when I go above 20lm/hr. I changed front wheel hub bearing. I changed tires. I changed compressor pully bearing, idler pulley bearing, water pump, timing belt, tensioner pully. I don't either this noise is coming front or back side.

Can anyone help me to pinpoint root cause.

 

What happens when it is humming and let off the gas does level change any at all?

 

It's difficult to hear any noise from the video, but you know your car. For me, I thought I had a noise starting maybe one year ago, and thought could be A/S 4's wearing out, but wasn't sure. Snow tire season came, and no change, so not tires. Spring came and hoped maybe backing plate got bent, nope. It did turn out to be the right rear wheel bearing since it got worse and worse and worse, once more obvious it could be pinpointed.

 

If you have a UL make certain someone hasn't left one of the back seat massagers switched on.
Took me 2 days to narrow down my constant hum from that damned thing. <LOL>

Otherwise, if the hum varies with engine speed the check the engine mounts.
If it varies with road speed it could be wheel bearings, tyres, or transmission mounts.

 

Just want to mention I have a similar issue: a whirring noise from front, fixed pitch, b-flat above 440A. Started after my last timing belt change/diff fluid service, 7-8 months ago. Emanates seemigly from front at 20mph or over. Hear it best at 40mph. Speed does not affect pitch, and revving the engine seems not be the issue. I'd swapped fornt tires on rotation nafter buying 1 used tire due to a bulge, and no difference. The mechanic didn't hear it but this place typically does not want to...

Braking MAY reduce it, but lower speeds tnd to be softer anyway. I hear it best on quiet roads at 40mph.

I did have 1 front bearing replaced years ago for a noise at similar speed, but that seemed more to 1 side. Dealer guessed and guessed right, but it was expensive. Mine does not seem to be getting any worse. My first concern was diff since they changed fluid, but it's apparently in the front. 2nd thought was timing belt or pulley as part of the service, or that I have original serpentine pulleys, but again, the sound is not speed-varying except that I hear it when the car i moving, above 20mph or so. It seems to be fro the chassis, not the engine.

Not sure if a fixed-pitch whine could be a bearimg, or this is some air flow whistle from the last service. Hard to get perfection. My main concern with an old car is safety, or damage to the car. For now, I'm living with it If you didn't know the car you might think it is normal.