Question about 2004 Chevrolet TrailBlazer

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I have a loud humming sound from the front end of my 2004 trailblazer 4x4 it gets louder with speed and only when i am going straight what could this be

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IF YOU TURN LEFT OR RIGHT DOES IT GO AWAY

Posted on Oct 13, 2010

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A jet engine type of noise from the engine area usually means the fan clutch is going bad. I don't think the tach is related to this, that could be the stepper motor for the tach going bad.

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My 2004 Oldsmobile Alero seems to have a loud humming sound when driven at certain speeds. The longer the car is driven the louder it seems to get.


sounds like a hub bearing going out? They don't generally get better with time.

Price is $55 to $75 for the hub assembly with abs sensor, and maybe 1 or 2 hours labor to put it in.

Good luck on it.

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MOST of the hums after a while come from the diff as the back axle does the driving and almost all its life runs the same way except when going in reverse ,is the rear diff meshing and worn on both the crownwheel and the pinion and the humming gets slightly louder the faster you go and almost goes when almost stopped and this can also be the slight vibration you get so get the diff oil drained and refilled and check if there is any metal in the oil when drained if so thats your problem But it will last for years like that..Let me know how you get on RON

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Sounds like the front hub bearing assembly.

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That's indicative of a wheel bearing, which is why you were told to change that out. However, it's also possible that the carrier bearings in the differential (where the drive axles attach) have gone bad. That happened to me on my 300ZX several years ago, and I had to replace the diff bearings. I would have them checked out somewhere other than a dealer (you'll probably get a better price from an independent shop).

As a sidenote, to be sure it wasn't a wheel bearing, if you hear it quiet down in a turn one way but get louder in a turn the opposite way, it's likely the wheel bearing. If you turn left at speed and it gets louder, then it's the right bearing (since you're loading up that side of the car). If it gets quieter in a right turn, it's the right side (you're unloading that side of the car and not putting as much weight on it, so it doesn't drag as badly). See if you get that symptom just to be sure that the wrong side front wheel bearing wasn't changed.

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Any suggestions?

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