There is a humming sound coming from the front end of my 1999 oldmobile alero. Only happens when the car is moving. I dont hear itat idle or even when pushing the gas at idle. could it be my transmission fluid being low?

1999 Oldsmobile Alero Stumble and Loss of Power 3000rpm

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Sep 28, 2008 - Engine Performance problem 1999 Oldsmobile Alero 6 cyl Front ... Hey All, Had a very rough running Mazda 626 on LPG, engine code FP.

1999 Oldsmobile Alero High Idle Fix - YouTube

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Jul 4, 2010 - Uploaded by GrindTimeAuto
1999 Oldsmobile Alero High Idle Fix ... How To Fix Or Prevent Stalling, Surging Or Rough Idle, Cleaning Throttle Body and MAF Sensor ...

AC COMPRESSOR PULLEY BEARING GOING BAD.

Sounds like it could be one of your hub bearings.

I have hd brand new thermostats that end up being bad for my Alero, 2 to be exact. Are you sure it's opening and closing properly?

They can be found at Auto Zones repair page:
http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Engine+Mechanical+Components&partName=Engine+Mechanical&pageId=0996b43f8036e748&subChapterTitle=Cylinder+Head&partId=0996b43f8036e7df

humming noise usually comes from wheel bearings. did you change that with a new bearing? also choppy or worn tires can cause humming noise that sounds like bad wheel bearings. rotate your tires and see if the noise changes. if so its tires. also even if it sounds like its from the right it could very well be a bad bearing in another location.

could be a lot of things fuel pump or maf or map sensor chech the device that hesures the air folw if it is unhooded rehook it and see what happens. If you need more help post here for more informtion.

check battery cables for tightness make sure they are clean free from corrosion. do a battery load test to make sure battery dont have a dead cell.

your fuel pump has a special sound when you turn the key to on and have someone stand by the back tires with their ear by the wheel well turn the key to on they should hear a humming noise as the pump pressurizes if you dont hear it the fuel but is bad and thats your problem

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.