Phaeton :: 2004 W12 - Humming Noise In Front End


Jan 22, 2011

I have a humming noise coming from the front end of my 2004 W12. I only notice the noise at highway speeds and it appears to only be audible when I turn the wheel to the right. For example, when traveling on the highway and the road bends slightly to the right or when I move into the right lane, I hear a faint hum coming from the wheel(s).

I started hearing the hum a few days ago but dismissed it as a symptom of my Phaeton Obsessive-Compulsive Disorder (POCD). While driving to and from DC last night on a night out with my wife, she commented on the presence of the hum as well.

I just had the LF wheel bearing replaced 2 weeks ago. Here are some possibilities I'v thought of:

RF wheel bearing
Low Power Steering Fuild
Other Steering Problems (leaking rack)

On a related note, where do you check the power steering fluid level? I can't seem to find the reservoir.

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My father and I have an '05 W12 Phaeton with 54k miles. It's developed a peculiar humming noise (very harmonic like a resonance) that is present any time the car is running. My father insists on taking the car to an independent European car repair facility instead of the dealership (much to my displeasure).

The shop first said it was transmission related and advised a fluid change. This did nothing to fix the issue and I'm not even confident that they have the ability to do such a thing correctly without dealer specific tools. Car never left the shop as that obviously did nothing.

Next, they claim there resonance was felt / heard through an oil line. They changed oil and filter thinking bad oil filter (crazy, I know). This also did nothing.

Now, they say that they attempted bypassing the oil cooler and this made the noise go away. The are advising replacement of the oil cooler assembly.

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I've only started noticing this recently. I have a 2004 W12 with roughly 75k miles. It seems to only happen after the engine warms up, but even then its seemingly randomly. I'll notice a clicking sound coming from the front passenger side of the engine. The sound increases in frequency as I rev the engine. I have no check engine lights and no noticeable loss of power. Its not a radiator fan since the sound is still audible when the hood is open. I'm getting no CAN errors with my generic OBDII scanner (I know its not a VAG-COM but hey).

I've been reading up on the possibility of it being a bad valve lifter. I don't know much about them and was hoping to get some advice here before I go about asking my dealership to diagnose the sound. I found this random article through google vaguely talking about replacing the lifter. The person says its "reasonable and inexpensive".

I also stumbled across this thread here describing what sounds similar. Although the thread provides no closure it seems towards the end people are hinting that the engine needs to be pulled? This is contradictory to the first source I found. My question is, say it was a bad lifter, whats the extent of work required to fix it? The Parts seem to be really cheap if I'm looking at the correct stuff?

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So the humming is still there and getting a little louder. I've rotated a couple times but the sound is the same. Non-distinct location; seems like it could be coming from all 4 corners.

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I had Toyo tires with some wear and had them rotated at another place other than my mechanic's. After that I noticed the humming noise in the front; it sounds like it is coming fron the driver's side and is most noticeable when I drive 35 or 40 mph. My mechanic said he checked everything carefully and couldn't figure out the problem.

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GMC - K1500 :: Humming Noise Coming From Front Differential

Firstly the truck in question is a 1994 GMC K1500 5 speed 350TBI.

Ok so I'm not sure what is causing the noise I'm hearing. its a humming that I think is coming from the front differential but I'm not sure, maybe it is the transfer case but it certainly feels like its in the front end and my steering does seem affected while in four wheel drive. It only makes the noise while in four wheel drive.

I have one off size tire on the rear end and I'm not sure if the actual tread circumference is the same between the front and rear tires or if any of this would really cause my four wheel drive to act up. I am planning on putting a new set of matched tires on it soon, so if they are the cause of the problem then that's good news.

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I've posted a video on YouTube of the car making the noise. It's a little hard to hear the noise in the video: [URL] .....

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The front end on the ex started humming really bad today after driving 350 miles to Memphis Tennessee. When I noticed the humming I pulled over and unlocked the hubs thinking the front axle is low on gear oil. No change when back on the interstate. If I turn right at highway speeds the noise completely goes away. While driving straight its pretty loud. The more I turn left the louder it gets. Just had the front end apart to do all ball joints tie rod ends etc. the hubs looked great and didnt have any play at all. The noise happens between 40-65 mph. After 70 mph the noise goes away. Doesn't go away when I let of the pedal, hit the brakes, put in neutral while driving, or accelerate. Could it be the hubs?

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